Funny / True Facts

Baby Echidnas

• The narrator failing to pronounce echidna right.
• The line afterwards informs you that echidnas were made 54 seconds after God created marijuana. And Doritos were made literally 10 seconds later.

Angler Fish

• "The female angler fish comes in many shapes colors and shades. Of ugly. It's like a rainbow. Of ugly."
• The Narrator describing the angler fish's lure as things like a "pashmina shawl", "lovely pair of leggings" and "decorative hat feather", whilst stating that their prey "pays the ultimate price for their vanity".
• "Hey there pretty lady. Nice gonads!"

Tarsier

• "It disguises itself in the forest by pretending to be a small teddy bear, undergoing a colonoscopy. It blends in magically."

Chameleon

• The description of chameleons as having "cool little alien karate chop hands".

Fruit Bat

• The narrator commenting on the scientific name of the fruit bat. "Yes, the Latins went a little apeshit with the naming of things, which is, however, lucky, because if YouTube had done the naming, these would all be called “Big-Ass Bat Check Out My Tumblr You Dickweed.com.”
• A fruit bat hangs upside down with the help of its cool little feet, “in order to create a chimney in the event of a dutch oven.”
• “Here, you can see different parts of the megabat’s anatomy. Its wings, its tiny round kneecaps…wait, those^note its testicles aren’t kneecaps. What are you doing, you’re licking—? Oh, my. Let’s just pretend they’re kneecaps.”
• “For amusement, groups of megabats hang on trees and, using the raincoat that evolution has given them, they flash one another. Mega-dirty. Megabat.”
• “When [Eric the microbat] was young, some of the other microbats called him 'Vagina-Face'. No one ever called him a flying fox. In fact, he was given the nickname 'Flying F[BLEEP]'. But those other bats were idiots, because Eric is a sensitive and wonderful microbat. He even writes poetry. About grapes.”

Sea Pig

• One way to tell the difference between a land pig and a sea pig is "that bacon from a land pig tastes delicious, while bacon from a sea pig tastes like a fish farted on a dirty beach cracker."
  • "Another way is to simply ask it whether it's a sea pig. If, when you ask, your mouth fills up with seawater, then you're probably an idiot, because the sea pig lives deep in the abyss of the ocean."
• "This is stock video of a sea cucumber, which has been downloaded one time. By me."
• The narrator explains the sea cucumber's self-defense system of shooting out its internal organs to confuse predators.
  "To understand this, imagine that you were getting mugged, and in response, you pulled your pants down, bent o—actually, I don't think that really helps."
• "The pearlfish hides inside the sea cucumber's butt, where it feeds and gains protection. The sea cucumber, meanwhile, has a fish in its butt. Win-win."
• "Remember, if someone scares you, just bend over and fart your lungs all over that bastard."

Duck

• The video starts off tame, with a simple clip of a baby duck and the narrator, in trying to start firing off facts about it, starting with a terse “they’re yellow”.
• The narrator, while describing ducks’... infamous sexual anatomy, advises the viewer, “to understand the corkscrew penis, imagine a penis shaped like a corkscrew”. And, likewise, “to understand the corkscrew vagina, imagine a vagina shaped like a corkscrew”.

Aye-Aye

• “The aye-aye resembles a cat who was bitten by a vampire, and then, halfway through the transformation, just said 'screw it'”.
• "Sadly, the aye-aye is threatened, partially due to a local superstition that if it points its middle finger at you, you have to kill it. Which is very similar to the customs of a North American fraternity party. Remember this: if someone gives you the finger, they might just be hungry. Or, they're a total ass — [Gasps over a photo of an aye-aye with its mouth open.]"

Mantis Shrimp

• Stating that their complicated eyes mean "it's impossible to get a read on what these little bastards are thinking."
  • A quick gag about dirty science and "sexnocular vision", since the shrimp has trinocular eyeballs.
• " They have little Edward Bowlingball hands that they use to punch the crap out of, basically, everything."
• The mantis shrimp, a colorful creature, is described as "dressing like an idiot."
• According to the narrator, the mantis shrimp is the ancestor of the modern-day clown. And that like the modern-day clown, the mantis shrimp has a psychopathic killing instinct.
  • Followed up with "if you're afraid of clowns, stay afraid."

Owl

• "Baby owls are called owlets, and look like a cotton ball that grew a face and legs. Owlets are born without flight feathers, and because they are vulnerable they camouflage themselves as Muppets."
• "Some owls bob their heads up and down in order to maximize their depth perception. Try it right now. Focus on an object and bob your head up and down. That's right, keep bobbing your head. It doesn't really work for humans, but you do look like an idiot."
• "Oh look, this one's playing with his friend... wait. What are you doing to that bird? Crap, you're not playing with him, are you? Well, don't try to hide it!"
• "And this is why it's polite to throw up at an owl dinner party."
• The entirety of the fairy tale.
  "A young girl is lost in the forest and she sees an owl and asks it 'Do you know where my mother is?' And the owl responds, 'Why the hell would I know where your mother is? Are you stupid? And why are you fairy tale children always getting lost in forests and hallucinating about animals that can talk?' And then the owl swooped down and ripped the little girl's face off and ate her eyeballs. And then the owl hooted 'hoo hoo.'"
• "Just remember, don't do drugs, because an owl may just rip your face off."

Frog

• The narrator is left at a loss when, just as he's explaining how a frog eats insects and worms, the frog in the footage devours a mouse whole.
• Explaining a montage of frog noises with "all those frogs were basically saying 'f[BLEEP] me'. Except for that last one - he was just saying- " [clip of a frog emitting a prolonged squeaky toy-esque sound repeats]

Cuttlefish

• "The cuttlefish's brain is larger than its entire body—including its brain. Which may not make sense, but it does to the cuttlefish... because it has a very large brain."
• "The cuttlefish has a very advanced eye, roughly in the shape of Charlie Brown's mouth when he misses a football. Or perhaps a W, that someone wrote when they were drunk. Or the letter Q, that someone wrote when they were really drunk."
• "Point is, don't let the tentacle parts wrap around your head. Or if it happens, plug your nose. ...'Cause your nose might get preeeeegnant."

Armadillo

• Listed among the things an armadillo's lack of armor on its underside leaves it vulnerable to is "a pit of boners". Acknowledging that that doesn't exist in nature, but that an armadillo would be vulnerable to it if it did.
• *over footage of a cat in a baseball cap* "The three-banded armadi- that's a cat."

Octopus

• "The cirrina octopuses look a bit like an alien got freaky with a weather balloon."
• “...Clams are stupid. I’m sorry to say it, but it’s true! They are dumb as hell.”
• While describing the various modes of octopus locomotion, the narrator breaks down into uncontrollable laughter when the footage shows an octopus running on the seafloor, using two of its tentacles as legs. "I think this one is my favorite..."

Marsupials

• The narrator's dirty sense of humor coming through when a clip of a newborn joey, which is slim, red, and almost featureless, clambering through its mother's pouch plays.
  Narrator: ...It looks like a dog penis that's trying to escape... [Giggling.] Run, little red rocket!
• The narrator's attempt to describe the koala runs afoul of Jerry.
  Narrator: ...but it appears to have received the short end of the evolutionary scht*ck. Jerry, don't bleep it like that, it sounds like I said... You don't even have to bleep scht*ck! Oh..."
  • He also describes the koala's adaptation of the hind gut as "a remarkable adaptation that the koala could have avoided by eating pretty much any other f*cking thing."
• The koala's tiny and smooth brain makes it the dumbest mammal on the planet, but it also gives it a distinct evolutionary advantage: it does not give a fuck.
  • "KOALAS IN THE RAIN! NO FUCKS GIVEN!"

Frog Fish (sic)

• "Each species has a camouflaging niche. This one, for example, has evolved to hide in a reef full of Grumpy Old Men."
• "Here the frogfish lies in wait, ready for unsuspecting prey to approach the seemingly harmless coral. Unseen—" [current carries coral away, with the frogfish on board] "--he will strike in the blink of an eye."

Carnivorous Plants

• "[Chuckling.] Like my mom used to say... 'if you need calcium, eat a milkman'."
• "It truly is like we are watching the ticking of nature's exquisite c[BLEEP]k. Why did you bleep that? I said 'c[BLEEP]k'! You're making it sound like I said cock! — Oh, okay."
• When explaining how the sun dew creates a gluey substance that both traps and digests creatures that land on it: "The more the animal struggles, the more they become entangled in this external stomach. Except if you are this spider. This spider does not give a f[BLEEP]k." [footage of a jumping spider devouring the droplets seemingly unaffected by their stickiness]

Ant Mutualism

• While observing a colony of leaf-cutter ants at work, the narrator praises some ants carrying leaves, and then says, "David...come back, David. That's poop."
• The narrator's choice to explain that from a tree's point of view, leaf-cutter ants carrying their harvest must look like they're making off with body parts like severed fingers, with the occasional snippet of nipple or piece of foreskin.
• “Don’t judge. If I could, I would secrete a tiny little hamburger out of my bellybutton for you to eat.”
• "This incredibly complex relationship is the result of nearly 50 million years of co-evolution. These fungi gave up the ability to create spores and are now utterly reliant on the ants to survive. By comparison, 50 million years ago, the major social breakthrough for our ancestors was learning how to throw poop at each other and then laughing about it. It's still funny."

Pangolins Posse

• While covering the numbat, the narrator admits that "myrmecophagous", the scientific term for animals that eat primarily ants and/or termites, doesn't really sound like a word... and sounds more like something would say while drunk. And then he demonstrates.
  Narrator: [Mumbling.] Gerbererger... myrmecophagous mondowahwehmuffn... 'You stole my blue lighter.
  • At first, he believes that the numbats eat the ants one at a time like tic-tacs... then gets a shock when he sees the extremely long tongue the numbat has.
• "Here we see an excerpt from the indie movie Snuffleupagus Goes to War."

Bobbit Worm and Polychaete Pals

• "[Christmas tree worms' scientific name is] Spirobranchus giganteus. Given that they are, on average, one and a half inches long, I'd say that's a bit of hubris. If one and a half inches is 'giganteus', trust me, I'll be referring to a part of myself as very 'giganteus' from now on. Don't be a perv; I'm talking about my pinky. 'Pinky' is what I call my penis. Who's the perv now? Oh - still me."
• "No, absolutely not. That is an acorn worm and we are not talking about the acorn worm."
• "This fish is having a good day. He just won a Fortnite Battle Royale, and his girlfriend sent him a Unicorn emoji, which means nothing to a fish, but it's still something...Bobbit worm don't give a f***."
• "It's kind of a 'Give me a kernel of corn and let's play butthole pachinko' type of worm."

Carnivorous Dragonflies

• “As they grow, however, they [dragonflies] devour almost anything they can catch, with the moxie of a drunk college student who found half a breakfast burrito in their mini-fridge.”
• "[The dragonfly nymph's labium] has nothing to do with the human labia, which has fortunately not evolved in this direction." Dragonfly nymph turns its head directly toward the camera. "Yet."
• "Water is drawn in through the butt. As it should be."
• “A good clenching creates enough internal pressure to cause the labium to pop out like the eyes on those little squeezy stress dolls. You can try this at home. All you need is a bathtub, a muffin, and a go-get-‘em attitude. Nothing will happen, but you might lose a roommate.”
• “Now, the anus of the dragonfly nymph is not your ordinary run-of-the-mill anus. Let’s try this. Close your eyes. Go ahead and picture an anus. Put a little hat on it if you want. Whatever you’re thinking right now, it’s not that. That is your very own imaginary anus. You're welcome. [Giggles.] ...You can keep it!”
• The narrator compares a dragonfly nymph shedding its larval skin to a hipster trying to get out of a pair of tight skinny jeans, and then follows with, “I have to say, that looks like it would be very satisfying, like popping a zit. Except you are the zit. And what comes out of it.”
• Apparently, a dragonfly nymph’s entrance into adulthood, growing fairy wings and fur, is “kind of like getting ready for Burning Man, but without the arguments over who’s bringing the weed and who’s bringing the Nutter Butters.”
• “While human entrance to adulthood is marked by pimples, useless hair on our genitals, and college debt, the adult odenate gets friggin’ wings. We totally get screwed.”
• Dragonfly wings “look a bit like stained-glass windows that were made by a coke addict being attacked by a squirrel…who is also a coke addict.“
• “From a scientist’s point of view, [the dragonfly’s hunting abilities] are a marvel of nature. From the mosquito’s point of view, it’s more like AAAAAAAAAAAAAAAAAAA…”
• The male dragonfly’s penis has bristled globes that allow him to scoop out a previous suitor’s sperm from the genitals of a female dragonfly. “Think of it as putting that little divider in-between your groceries at the checkout line. And imagine that your groceries were sperm.”
• *over footage of two mating dragonflies* "This young couple is searching for-" *they get eaten by a fish* "whoops, nevermind."
• "Or maybe, the bebes should go - RIGHT - FREAKING - OVER - HERE - AND - HERE!"

Ogre Faced Spider

• In explaining cribellate silk, the narrator explains that "cribellum" means "field of d[BLEEP]s". ...Except that's not correct. It translates into "little sieve". Meanwhile, the surface texture of cribellate silk when magnified resembles... a field of d[BLEEP]s.
• The narrator noting that the angle of one clip of an ogre-faced spider repeatedly biting into her prey makes said spider look... uncannily expressive.
  Narrator: [Chuckles.] She looks pissed... Like a lunch date after a bad argument. Rage-chewing.

Sand Bubbler Crab

• The sudden Aliens-like "OH, GOD!!!"
• "Dave, pictured with a coin so you get a sense of how rich he is..."
• "If you have ever eaten sand before, you may be thinking" 'Why the f**k are you eating sand?!'"
• The dubbing over protozoans the sand bubbler crab eats.
  Hydromedusa: No, no plans tonight, just staying and watching Fleabag. Oh, we're going to the club? One second. *Unfurls her medusae tendrils* Alright, I'm ready.

Stinkhorns

• After we witness the nightmare-inducing fruiting of a red cage stinkhorn, the narrator shows us a video of a puppy and a kitten playing together to balance things out.
• Footage of one particular stinkhorn, which looks oddly phallic, leads to this gem:
  Narrator: Jerry, I feel like these remind me of something, but I just can't... it's on the tip of my tongue. Oh, it's on the tip of your tongue too, Jerry? Well, I'm sure if it's on the tip of both of our tongues, it'll come to one of us. If it comes to you first, Jerry, just spit it out.
  • Shortly afterwards, we get footage of one of these stinkorns snapping, which causes the narrator to wince in sympathy pain.
• "Like flowers, they enlist the help of insects. But these insects are metal."

Mudskippers

• "Da-doing-doink."
• A few different clips of mudskippers fighting with their mouths wide open play one right after another, all overdubbed so that each of the fish is wordlessly, consistently yelling at its opponent... and so that, in the case of the last one, the fighting gets cut off by one of the fish randomly kissing the other and getting a surprised little "...oh!" in response.

Ostrich

• Ostrich feet only have two toes each... "but don't feel bad for it. It can still do the peace sign. Or stick its thumb in a pumpkin and tickle a kitten."
• The narrator explains that during mating season, ostriches usually form harems in which one female is the male's "main" partner.
  Narrator: But his side ostriches out of your league too ah.
• After the genitals wind up needing to be blurred on a clip of ostriches immediately after mating, the narrator realizes he probably can't show up-close footage of an ostrich laying an egg... so he decides to simulate it instead with a clip of a person spitting an egg out of their mouth with their face covered in feathers. You'll see a number of people in the comments saying that it actually took them a moment to realize that's what they were looking at.
• The narrator describes being a small land creature at the end of the Cretaceous period as "riding a tricycle in a moshpit."

Skeleton Shrimp

• The Running Gag of skeleton shrimp apparently being rude to animals like seahorses, flatworms and seasnails, accompanied by footage of the shrimp mobbing said animals.
• The narrator happily describes skeleton shrimp as "kind of cute... like little peoples!" This is apparently such an important thought to him that the video description, too, is "They look like little peoples".

Mating Dance of the Peacock Spider

• After the first pair of spiders in the video are dubbed as sort of Adorkably flirting with each other, the second pair's courtship goes... differently from the moment the female spider basically orders the male spider to turn around and back it up.
  Female Spider: You know the game "Fuck, Marry, Kill"?
  Male Spider: [Anxiously, while dancing.] YEAH...?
  Female Spider: Well I'm gonna play that with you!
  Male Spider: [Still very anxious.] ...ALRIGHT?
  Female Spider: But I don't wanna get married!, okay?
  Male Spider: ...Is it weird that I'm kinda turned on right now?
  Female Spider: Pete, shake. That. Ass. For. Me.
  Male Spider: ...Now?
  Female Spider: Now.
  • Followed by the male spider going "f*ck it" and breaking out in song and dance smooth-jazz style while doing the male dance.

Nudibranchs

• "To understand [torsion], imagine if you laid down on your stomach and arched your back. Then, you grabbed your left foot with your right hand, and your right foot with your left hand. Now imagine twisting really hard so that your butt faces upwards and is right over your face. This is the first yoga pose they teach you when you arrive in hell."
• "This one is perfectly camouflaged as an old man with his hands behind his back, inspecting his garden."
• A nudibranch attacking a sea anemone "with the vigor of a proctologist who lost a wedding ring."
• "Scary clown says run away."
• The narrator's "pew, pewpewpew!" sound effects over the footage of nematocysts (stinging cells) firing.
• "It's a sacoglossan sea slug, not a nudibranch, but who cares? I love it. It's cuter than puppies."

The Wacky Giraffe

• The Bait-and-Switch involving the giraffe's family, genus and species - Giraffidae, Giraffa and... camelopardalis.
  "Because, to whoever discovered it first, it apparently looks like the product of a camel and a leopard. Humping. Kill me."
• The long-winded comparison of giraffe fights to the shoving matches had by surly teenagers who don't dance at parties.
• In trying to divine how the giraffe evolved its long neck, the narrator tries to bring up the okapi, but gets frustrated upon seeing it:
  Narrator: Oh, for f***'s sake, you can't learn anything from that! That's like trying to learn the principles of Swiss minimalist design from a Lisa Frank sticker! No, I didn't collect them! Yes, I did.
  • This then leads to a bizzare, rambling diatribe with the narrator claiming that giraffes are sock puppets that look like ducks. And then it gets even weirder.
  • He continues to rag on the okapi in The Stinger:
    Evolution: Let me get this straight: you want zebra camoflague on your ass and legs and a little on your head, and that's it.
    Okapi: Yep!
    Evolution: ...you realize that, in a pack of zebras, you will appear as a floating steak?
    A photoshopped image of a steak appears over the okapi's body
    Okapi: Yep!

Backward Hippo

• The whole video, since the footage consists of hippo butts played in reverse, and passed off as the fronts of a fictitious creature called the Oppih. Made funnier by the fact that it happens to be pronounced as "oppai", well known among anime and manga fans as the Japanese word for "boobs".
  • More specifically, the Oppih is described as a "vacuum-feeder" that eats by using the "intense negative pressure" from the movement of its nose to "suck unsuspecting ants out of the ground and into its mouth". This is accompanied by reversed footage of hippos dung-showering.

Killer Surfing Snails

• AAAAAAAAAAAAAAAAAH-
  Narrator: Let's back up a bit.
  • This happens twice.
  • And a third time at the end, this time cut off with:
  Narrator: This is really getting embarrassing for the both of us.
• When talking about a snail that carries its babies on its back:
  " Caviar and escargot all in one. Very French. They're going to die too.
• "But Abby is not the only snail on this bitch—beach."
• "Beach life is so simple and predictable that over the years, that they've lost their eyes and their tentacles, sort of like how human surfers eventually lose their shirts, and shoes. And jobs."
• The abundance of jokes about how Agaronia looks like a penis and testicles while it's feeding.
• Agaronia are so aggressive that they'll attack things they couldn't possibly fit their mouths around. "...but they'll give it the old college try."
• The narrator jokes that scientists with a foot fetish enjoy studying this snail.
  "Heheh, look, it's trying to eat a people!"
• "Yet another snail that surfs is—just kidding. There's no more. You got scared there for a second, didn't you?"

BatFishes

• Near the end of the video, the narrator goes on a bit of a diatribe about how batfish are eternally pissed off. Not only because they're called batfish, despite not resembling bats, but there's a lot of other fish out there also called batfish, just to be even more confusing:
  • One species, Platax pinnatus, has juveniles that actually mimic the toxic flatworm Pseudobiceros hancockanus.
    Narrator: And no, I'm not gonna slow that word down so you can spell it, perv.
  • Platax orbicularis juveniles actually mimic dead leaves, but aside from that, this fish has the unfortunate habit of following turtles and eating their poop. The narrator goes on to imagine that land bats don't want this fish named after them, as well as the awkward conversations the turtle has to have when he turns up at a party with one of these fish in tow.
  • The flying gurnard Dactylopterus volitans is sometimes called a batfish, but it's more closely associated with the searobins.^note Taxonomically, this is not strictly true, but historically they've all been referred to as "gurnards."
    Narrator: Because they fight crime together—duh.

The Incredible Tardigrade

• Jerry the researcher's hapless attempts to create a scale model of the minute creatures, apparently out of whatever he can find around the office. It starts with plasticine and goes swiftly downhill from there.
  • When the narrator complains these models aren't realistic, Jerry's solution is to switch the shot to black and white (he also adds a scale reading 'Small') which is about as helpful as you'd expect. "Science isn't a style of photography, Jerry!"

Cats' Killer Senses

• The ad break for Marvel: Contest of Champions features a few gems as the narrator describes the various animal-themed Marvel characters.
  "Tigra here has heightened strength, speed, stamina and razor-sharp claws. I do not. But I do look exactly as good as Tigra when I wear this outfit."
• Zefrank compares being licked by a cat to listening to a two-year-old blow air into a harmonica: "Adorable for the first few seconds, then painful".
• One clip of a lion looks just about ready to be all majestic and graceful, only for it to turn its gonads towards the camera and spray. Zefrank's commentary is that lion culture is basically like the Internet, "except communicated by pissing all over stu—it's basically the Internet."

Super Very Clever Macaques Wow

• The narrator struggles to pronounce the word 'macaque' for a moment and asks Jerry for help:
  You think it's 'muh-cock'? No, it's too long to be 'muh-cock'.
• The Running Gag of Zefrank casually mentioning an unpleasant thing, and then going "Oh, sorry, I forgot to tell you about [unpleasant thing]".

The Hummingbird Warrior

• The whole thing really, starting with the extended digression on how hummingbyerds are tiny enough that they're sometimes mistaken for moths "and the blue jays, you know how they tease, they're like 'Hey, where's your poop-a?' and the hummingbird is all 'It's pronounced pupa, and I'm not a moth!' But if you start correcting the grammar of a bully, then you're a nerd bird. And they're like 'Hey nerd bird, you gonna stick your freaky fingernail tongue into some flower's sexy hole?' And... well, honestly, that one's actually fair."
• The Running Gag equating hummingbirds' dependence on sugar to drug addiction. "But you don't just wake up one day saying you want to deep-tongue a flower. Just like no-one has a to-do list that involves trying to snort cocaine residue out of a shag carpet."
• At several points in the video stock footage of a moth is shown, to which the narrator exasperatedly says "Jerry, that's a moth."^note This particular species of moth, the Hummingbird Hawk Moth, looks a great deal like a hummingbird due to convergent evolution.
• Jerry the scriptwriter goes a bit overboard with the innuendo in this one:
  Narrator: But of course a well-hung feeder is the motherlode— Jerry, Freud would have a field day with that sentence; you need help.
  Narrator: ...you'd start feeling ridden hard and put away wet. What is that, Jerry? that sounds dirty. ...it's about what? Jerry, we don't use that word! Oh, I see, a horse. You're saying a horse. Well, that's perverted, Jerry.
• "When springtime approaches, the hummingbirds start to get horny, and they prepare to do a kind of Reverse Spring Break. While college students fly south to sip on drinks with flowers in them and get laid in places like Cabo San Lucas, hummingbirds leave places like Cabo San Lucas and fly north to sip on flowers with drinks in them and get laid in places like Toledo. I'm not busting on Toledo... [chuckles] I'll leave that to the hummingbirds... Sorry."
• "Dr. Chris Clark and his team put some of these feathers into a wind tunnel. I mean, if you had your own wind tunnel you'd put all kinds of things into— well, not a baby. Or mayonnaise! But definitely the butt feathers of a bird."
• The narrator gets a kick out of slowing down the footage of one hummingbird's tail noise to make it sound exactly like a fart.

Snake and Lizard Tongues

• The narrator defending Dr. Kurt Schwenk's study of snake and lizard tongues:
  "No, Jerry, it's not a fetish! If a scientist does it, it's an 'area of interest'."
• The narrator encourages the user to mimic the flickering tongue of a snake, then points out that "When humans do this, it's called an 'HR violation'."
• The entire sequence of the squamates asking Evolution if they can smell with their tongues, much to evolution's incredulous surprise. Especially when the ancestor of the snakes claims that they'll give an arm and a leg to be the best at it.
  Narrator: And that was the start of the negotiation.
  • This gets followed up at end of the video, which has Evolution in the middle of a phone call with somebody else concerning all this, capping it off with the gecko deciding it wants to lick its eyeballs.
    "I mean, sometimes, I don't even know why I'm putting in all this effort. Lick your eyeballs... Why don't you go ahead and lick your ***?"

Deception in the Rainforest

• The Running Gag of ZeFrank namedropping various scientists... who are dead. Leading to:
  "Mimicking the predator you're trying to avoid is called Gilbertian mimicry, after Lawrence Gilbert... who is not dead. But based on the last two, I'd be worried."

Trap Jaw Ants

• To explain the spermatheca, the narrator uses quite the colourful turn of phrase:
  Narrator: Imagine you're on the Wheel of Fortune and the answer is 'scumbag', but someone still has to guess an 'S'.
  (censor beep)
  Narrator: Jerry, I didn't say any— oh, you were bleeping what they were thinking. Right.
• "Sure, it may seem like Mildred is overdoing it a bit with this termite, who seems quite defenseless. But you never know. Termite might be talking sh*t!"
• "Now you may have noticed something else, right here—those four little bumpy things. Scientists call these 'sticky doorknobs.' Not kidding. Sounds like a good name for a f**k band. Jerry, why did—I said f**k! You think I said f**k? Tell me, what is a f**k band, Jerry? The bleep button is a privilege! Amateur. Anyway, these sticky doorknobs—which they probably called 'sticky knobs' first, until the UK scientists were like 'Nope!'—these sticky doorknobs are used to stick the larvae right up onto the wall."
• Over an animation of the evolution of trap-jaws within a particular ant genus:
  "It's like a cartoon, to terrify the children! Play this in sex-ed class. Without telling anyone what it is."

The Platypus Conspiracy

• The whole thing, essentially being a Call-Back to "Backwards Hippo", with the narrator passing off reversed footage of beavers as a fictitious new species of platypus. Until Jerry fails to fade out at the right moment.

The Beaver

• In the leadup to discussing the structure of rodent teeth, the narrator notes that tooth enamel is made of crystals of a mineral called hydroxylapatite, which he describes as a "dad joke time bomb". Said bomb goes off when he shows a cross-section of an elderly horse, whose teeth have been worn down with age and wear:
  "This horse won't be able to eat much longer, because it's lost it's apatite!" (chuckling) "Ah, that's it..!"
• At one point, the narrator gets into an argument with Jerry over the term 'peer review', which the latter seemingly heard as 'pee reviewed'.
  "No, I'm not saying the same thing. I'm saying 'peer', like someone in the same field. No, they're not peeing in a field, Jerry, no-one's peeing! Just leave it!"
  • It comes back at the end of the video when, after Jerry fades out the video prematurely due to still being mad about it, the narrator takes him to task about how he apparently thought 'peer review' had something to do with urination.
    "What did you think 'peer review' was? ...well, Jerry, that's not science, that's niche pornography!"
• The narrator has a little fun with the fact that beavers are coprophagous - they need to eat their own poop to get more nutrients out of it.
  "So not only do they have to chew the crap out of their food, they then have to chew the food out of their crap!" (restraining laughter) Alright, I'm done."

Tarantulas

• A tarantula is shown eating two crickets... one of which, apparently unconcerned by its fate, is eating the other cricket. Cue the Voice Clip Song remix:
  CRICKET! THAT! DON'T! GIVE A! FUCK!
• The narrator describing the urticating setae of some New World tarantulas:
  "And let me tell you, if these urticating hairs get on your skin, or in your eyes or in your mucous membranes, they can urt like hell. Kill me."

Parasitic Birds

• The narration over footage of a cuckoo removing another species' egg from its nest, after laying one of its own:
  This one's looking 'guilty A.F.,' as the kids might say. That's right, you little [bleep]er, you're caught on camera!
• Ze's explanation of how shiny cowbirds drop their eggs onto the host species' eggs, which sometimes cracks the shell of the latter.
  That's some cold [bleep]. You're not even born yet and you're an accessory to murder!
• American robins are good at identifying eggs by color or markings... by shape, not so much.
  And look at this. It'll even try to hatch a Minecraft egg!

The Smartest Slime

• A clip of cell mitosis occurring plays in which the clusters of genetic material involved are visible in two irregular parallel white rows that split apart when their cell does, making them resemble a toothy mouth stretching open at the moment of division. The narrator notes with amusement that "it look[s] like the scream of a night demon", immediately playing back the clip edited with a superimposed skull and sound effect to match that description all the better.
• After discussing how slime molds are able to find the most efficient routes between resources, Ze explains a study that used this ability to map a transport network in the Kanto region.
  They put food on a map at each train destination, and plopped a slime mold right on top of Tokyo. Think very low-budget Godzilla movie.
• Over microscopic footage of two slime molds merging to exchange information:
  Ooh, that's satisfying. No, Jerry, it's not sexy! All right, maybe it's a little bit sexy.
• The Hilarious Outtakes over the closing credits. (In the main body of the video, the footage in question was compared to "a scab in a Jacuzzi.")
  That looks like Satan's caviar! [clip replays] It looks like what I thought STIs were when I was ten! [clip replays] Looks like a smoker's lung on Pop Rocks! [different clip plays] Looks like what happens when m'dog gets into the blueberries!

Fungi That Control The Insects They Eat

• The video is rife with Black Comedy due to the subject matter - namely, fungi that hijack and devour the host insects:
  • Jerry's insistence on using the term "spore boner", much to the narrator's irritation.
  • One parasitic fungus causes the corpses of infected flies to release chemicals that induce healthy flies to mate with said corpses, which then become attached. The narrator mentions that the subsequent corpse stuck to your backside would make for an awkward conversation at work.
    Narrator: You know Dave from accounting is going to say something like, "Oh, looks like you had an interesting weekend." And you're like, "Yes, it was a nice weekend, Dave. Went antiquing, planted some herbs, f***ed a corpse, and did some light spring cleaning, thank you very much. Freaking Dave."
  • The narrator immediately notes that the fungus Massospora, which specializes in infecting cicadas, is yet another "dad joke time bomb". Said bomb goes off when it's revealed that Massospora first eats the abdomen of the host cicada, then creates a plug of spores to replace it:
    Narrator: You could say that the cicada's back end is a massospora! (Corpsing) I told you!
  • Going even further than that, some Massospora species pump the host cidaca full of psilocybin, the hallucinogenic compound found in magic mushrooms, as well as the stimulant cathinone. Which means the cicadas are essentially perma-tripping.
    "Todd, what happened to your ass?!" "Who cares?! Whooooooo!"

True Facts Animal Awards: Tangle Worms, Creepiest Dave & Much More

• The single best joke in the series is one that has taken years to build up to. While dealing with colonoscopy, the narrator does the "but scientists" Running Gag, but in reverse, declaring "but scientists- excuse me, butt scientists", in a kind of Russian Reversal of the original gag!

The Curious Adaptations of Sharks

• The narrator has a lot of fun with the word "denticle."
  Science hippies dented these testicl-- sorry. Tested these denticles, to see what effect they have on the flow of water around the shark.
• After explaining how denticles reduce drag as the shark swims:
  Listen, you try to swim in drag! Your boa gets all tangled, and never mind the petticoat.
• "Many sharks can swim quite quickly. This comes in handy, because sharks live in places where there are sharks."
  • The first time this line is spoken, Jerry inexplicably decides to illustrate it with a clip of an epaulette shark swim-walking very slowly. The narrator complains that it's ruining the reputation of other sharks this way.
  Try putting that in a scary movie, Jerry. 'Look out, shark! Everyone walk at a moderate pace in the opposite direction!"
• The Running Gag of: "If you've ever [done a thing], you've probably [gross experience related to the thing], but you've also [thing actually related to the subject]".
• The narrator having another rant at Jerry for simplifying the male sharks' claspers as a 'double penis' just because it looks that way:
  If that were true, we'd be in a pickle! I mean, right there, pickles! You want a jar of d***cks, Jerry?!

The Rise of the Kitten Snake

• The narrator describing one rodent as "Mr. Magoo as a Furby", then chuckling as he realizes how much that reference dates him.
• Jerry's insistence that mustelids can fart bees, which the narrator quickly grows irritated by. In fact, the wolverine is skipped entirely because Jerry didn't do any other 'research' other than that.
  • When they get to badgers, Jerry hastily deletes the word 'bees' right as the narrator gets to it, leaving him saying that all badgers can fart. The narrator grudgingly admits that at least it's true now.
  • At the end, the narrator takes Jerry to task about this, eventually admitting that yes, he too wishes it was possible.
• The narrator goes on a bit of a rant concerning how people find otters floating on their backs while eating cute:
  "Even though if I do the same thing, but on a couch, naked with a bag of chips propped up on my tum-tums, for some reason, I look pathetic! It's a double standard and it's bulls***."

The Crazy Defenses of Butterflies and Moths

• The narrator has to chide Jerry twice for insisting that butterflies are killing machines with razor-sharp wings. On the third time, however, when Jerry calls them the "scary clowns on the insect world", this leads to a realisation.
  "Jerry! You're afraid of butterflies! They aren't dangerous. No, clowns are. But butterflies aren't."