Line #8 Main/MeekMesozoicMammal


1	-> "[''Repenomamus''] contradicts conventional evolutionary theory that early mammals couldn't possibly attack and eat a dinosaur because they were timid, chipmunk-sized creatures that scurried in the looming shadow of the giant reptiles."
2	-->-- [[https://www.geologyin.com/2005/06/dinosaur-fossil-found-in-mammals-stomach.html "Dinosaur Fossil Found in Mammal's Stomach"]], Geology In, 2005
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4	The Mesozoic is commonly called "the AgeOfReptiles" because the largest animals at the time (and the largest land animals of ''all'' time) were all reptiles, from non-avian dinosaurs on land, pterosaurs in the sky, and mosasaurs, plesiosaurs, and ichthyosaurs in the water. Not long after dinosaurs became dominant in the early Jurassic, the first true mammals evolved, but due to reptiles occupying all the large niches, they rarely reached a metre long.
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6	Since MostWritersAreHuman and ReptilesAreAbhorrent, it's easy to sympathize with our distant ancestors. In fiction, non-fiction, and {{Speculative Documentar\|y}}ies alike, they're usually portrayed as underdogs whose potential is yet to be unleashed as they cower beneath their [[PrehistoricMonster dinosaur overlords]]. This trope may have risen to popularity in The80s, when HollywoodPrehistory became a DeadHorseTrope coupled with the Dinosaur Renaissance influencing popular culture, establishing dinosaurs as complex and prosperous even today.
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8	In RealLife, this trope wasn't the case, as they were quite a diverse and successful group back then, with swimmers, gliders, and burrowers among their ranks. Some of them were so big and fierce that they even ''ate'' small [[https://en.wikipedia.org/wiki/Repenomamus dinosaurs.]][[note]]We're not just talking dinosaur eggs or hatchlings either, adult dinosaurs up to ''two metres long'' may have been on the menu for certain Mesozoic mammals according to [[https://phys.org/news/2023-07-unusual-fossil-rare-evidence-mammal.html 2023 findings]][[/note]] The trope also gets a bit surreal when you consider the predecessor to mammals, the Therapsids, were the dominant land animals of the Permian Period that immediately preceded the Age of Dinosaurs. The Permian ancestors of dinosaurs meanwhile were the small forms occupying niches not unlike what mammals would in the Mesozoic.
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10	PrimateVersusReptile is a related concept, where a mammal and a dinosaur-like reptile are seen as adversaries with the mammal usually being the more "heroic" of the two.
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12	!! Examples
13	[[foldercontrol]]
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15	[[folder:Art]]
16	* Were-mammals in the world of ''Art/BeastFables'' revere a Moses-like figure called [[https://www.deviantart.com/nazrigar/art/Weretober-2022-Ancient-Werebeasts-Part-1-934319591 the Torch Bearer]], a ''Didelphodon'' who led their ancestors to safety away from the [[TerrifyingTyrannosaur Tyrant King]], [[ImpliedTrope implying]] that other mammals at the time were meek.
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19	[[folder:Comic Books]]
20	* ''ComicBook/AgeOfReptiles'': "Tribal Warfare" features a primitive primate-like mammal as a ChekhovsGunman in the ''Tyrannosaurus'' nest. It's easily chased off even by a ''T. rex'' baby, but it gets the last laugh in the end. When [[spoiler:the last surviving ''Tyrannosaurus'' returns to the nest after the FinalBattle, he discovers the mammal eating the last egg.]]
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23	[[folder:Films -- Animated]]
24	* ''WesternAnimation/{{Dinosaur}}'': The lemur tribe (which live on a tiny isolated island) is extremely fearful of dinosaurs before adopting Aladar, and evidently dinosaurs do not think much of them either. When Baylene and Eema first notice the lemurs riding on Aladar's back, the two equate them to skin parasites.
25	* ''Anime/DoraemonNobitasNewDinosaur'': As the gang trek through a Cretaceous forest, they come across a colony of ''Deltatheridium'' scampering across their path. However, Doraemon flees up a tree in terror at the sight of the small mammals, due to them resembling mice. Later, Doraemon encounters a ''Repenomamus'', a larger mammal that preyed on small dinosaurs, that eats his piece of the Tomodachi Chocolate meant for Cole the ''Tarbosaurus'', and it promptly flees when Cole comes their way.
26	* ''WesternAnimation/TheLandBeforeTime'':
27	** In the first film, a recently-hatched Ducky briefly chases after a small, shrew-looking mammal, who runs away and hides under a snapping turtle.
28	** ''WesternAnimation/TheLandBeforeTimeIVJourneyThroughTheMists'' plays with this with Tickles, a ratlike mammal. While he is prone to fleeing away from larger animals as the rest of his kind are, he has a moment of bravery when he saves Ducky from being eaten by [[FeatheredFiend Ichy]] and [[NeverSmileAtACrocodile Dil]].
29	* ''Anime/YouAreUmasou'': During his mad search for Umasou, Heart terrifies a squirrel-looking mammal into [[PottyFailure wetting itself]].
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32	[[folder:Films -- Live-Action]]
33	* ''Film/SuperMarioBros1993'': The animated prologue shows Brooklyn 65 million years ago. Two grazing dinosaurs (a sauropod and a ''Triceratops'') are depicted, and a small mammal scurrying beneath them (represented [[AnachronisticAnimal by a skunk]] of all things). The skunk takes one look at the ''Triceratops'', gets so scared its stripes fly off, and runs away in terror.
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36	[[folder:Literature]]
37	* The page spread about dinosaurs in ''Literature/GuinnessWorldRecords 2011'' mentions that 115 million years ago, the number of mammal species was increasing, but their size was restricted due to the dominance of dinosaurs.
38	* In ''Homchen'' by Creator/KurdLasswitz, the protagonist (a monkey-like marsupial in the Late Cretaceous) attacks and kills a reptile at the beginning through deception, and it is treated as some great crime and rebellion against the natural order both by the reptiles and the other mammals (even his own ''parents'').
39	* ''Literature/TheNewDinosaursAnAlternativeEvolution'': It's made clear that the continued dominance of the dinosaurs has prevented any possible diversification of mammals, and they have all remained small and rodent-like. Only one mammal gets any focus, the desman-like zwim, although unnamed mammals appear as generic prey animals in a few other entries.
40	* ''Literature/RaptorRed'': One chapter focuses on a tiny, shrew-like mammal that lives in the same area as Red and her family, and his struggles to avoid being eaten or stepped on by the massive dinosaurs. Though he does escape one dinosaur's attempt to eat him by biting it on the snout.
41	* ''Literature/{{Silverwing}}'': The distant prequel ''Darkwing'' is set shortly after the K/Pg extinction event. The small mammals have noticed that the mighty dinosaurs and pterosaurs (called "saurians") have been decimated by some incomprehensible cataclysm and many of the survivors are dying of a rotting plague. The mammals form a pact to work together and destroy as many saurian eggs as possible to prevent them from ever dominating again (because adult dinosaurs, or even juveniles, are far too powerful for the mammals to destroy).
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44	[[folder:Live-Action TV]]
45	* ''Series/{{Dinosaurs}}'': Small talking mammals make up the dinosaurs' main diet (followed closely by ''other dinosaurs''). They are shown kept alive inside their refrigerators, and will often argue with their predator, even in the middle of being eaten.
46	* ''Series/MammalsVsDinos'': The entire documentary shows how tiny mammals evolved and developed in the shadow of the dinosaurs, either as prey or utterly beneath the notice of the reptilian giants. Even ''Repenomamus'', a relatively large Mesozoic mammal and shown as a predator of dinosaur hatchlings, is depicted being quickly killed and eaten by a pack of ''Dilong''.
47	* ''Series/PrehistoricPlanet'':
48	** In the episode "Ice Worlds", an Alaskan troodontid is shown using fire to smoke out a number of small burrowing mammals (identified by WordOfGod as ''Cimolodon''), and it easily captures and kills one of them.
49	** The second season episode "Islands" has a segment focusing on an ''Adalatherium'' (a burrowing mammal the size of a badger, relatively big for a Mesozoic mammal) raising her young. After her burrow gets discovered by a ''Masiakasaurus'' which falls prey to the large snake ''Madstoia'', the ''Adalatherium'' decides it's time for her and her offspring to move out.
50	* The OpeningNarration for ''Series/WalkingWithBeasts'' describes mammals as living in the shadows of dinosaurs for over 160 million years, over footage of two mammals hiding while a theropod and an ankylosaur fight, but that their time would come when the asteroid hit.
51	* ''Series/WalkingWithDinosaurs'':
52	** The cynodonts from "New Blood" are stem-mammals, and [[DownplayedTrope while they put up more of a fight than their descendants in the series]], they ultimately have to abandon their burrows to escape the predations of the ''Coelophysis'' (note this is a world where dinosaurs ''aren't yet'' the rulers of the land).
53	** The unnamed mammal in "Spirits of the Ice Forest" ([[AllThereInTheManual identified as]] ''Steropodon'' in the book and [[{{Slurpasaur}} live-acted]] by a coati) is wimpy enough that a dinosaur the size of a small child scares it off by ''throwing debris at it''.
54	** ''Didelphodon'' is the representative of the mammals in "Death of a Dynasty", and is invariably shown as either a nest raider or a scavenger, with several individuals getting eaten by a female ''Tyrannosaurus'' after trying to raid her nest. Here, though, the mammals are actually doing fairly well, [[RuleOfSymbolism as the age of the dinosaurs is about to close out]].
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57	[[folder:Video Games]]
58	* {{Discussed\|trope}} in ''VideoGame/AnimalCrossingNewHorizons''. Blathers describes ''Juramaia'' (one of the collectable fossils, a mammal from the Jurassic) as being small and (possibly) nocturnal so it could hide from dinosaurs. "They needed every advantage to live among those behemoths."
59	* Averted in ''VideoGame/ZniwAdventure'', which takes place in a prehistoric world where [[WorldOfFunnyAnimals dinosaurs are anthropomorphic and civilized]]. Small mammals appear, but they are not anthropomorphic. Instead, they are animalistic creatures that the dinosaurs treat as pests. The player is clearly meant to sympathize more with the dinosaurs than the mammals. Some dinos are tasked with catching mammals to keep them out of their food supplies. It's never outright stated if any dinos eat mammals, although there is one segment where Zniw helps a dino catch some mammals, and each time Zniw gives a mammal to the dino, he turns away from the camera and does... ''something'' with it. Considering that it's heavily implied that [[SapientEatSapient some dinosaurs still eat each other despite being anthropomorphic]], it's definitely possible that some dinos eat mammals.
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62	[[folder:Web Original]]
63	* While all the vertebrates in ''Blog/HamstersParadise'' are mammals, the original draft features an era called the Mouseozoic that resembles the Mesozoic. The largest animals at the time resemble dinosaurs, but there's a group of small hamster-descendants that have changed little from their ancestors called neomice, that are mostly noctural and low on the food chain. [[spoiler:They're among the few lineages to survive the ice age that ends the Mouseozoic.]]
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66	[[folder:Web Video]]
67	* Discussed in Moth Light Media's video [[https://www.youtube.com/watch?v=CaPVvSgU7ko "The Mammals that Lived Alongside the Dinosaurs"]]. He says that framing Mesozoic mammals as hiding in trees or burrows from their "saurian oppressors" is unfair because they were far more diverse than most people think.
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70	[[folder:Western Animation]]
71	* ''WesternAnimation/SixtyFourMillionYearsAgo'': The documentary short centres around a primitive mammal surviving at the end of the Late Cretaceous (which, in reality, was about 66 million years ago, not 64). Even the smallest dinosaur shown, the ''Ornithomimus'' is a threat to it, and the narrator states how the dominance of the dinosaurs prevents mammals from growing larger or diversifying beyond tiny insect-eaters cowering in their shadows.
72	* ''WesternAnimation/DinkTheLittleDinosaur'':
73	** In "Surprise", Dink befriends a mouse-like mammal named Tiny whose attempts to get fruit are being thwarted by a brutish sauropod keeping the fruit tree to himself. The two team up to deal with the sauropod, with Tiny climbing onto the sauropod's back and covering his eyes with a flower to distract him while Dink ties his tail to the tree.
74	** Downplayed with the mammal pair from "Small Stuff" who are bold enough to try to stop the kids in digging a new waterway that happens to be right in the direction towards the mammals' burrow.
75	** Inverted in "Overrun", where Green Meadow gets infested with swarms of rat-like mammals that are vicious enough to send large dinosaurs fleeing.
76	* ''WesternAnimation/DinosaurTrain'':
77	** "Tiny's Tiny Friend" introduces Cindy ''Cimolestes'', a possum-like mammal who's terrified of the local dinosaurs (and ''Pteranodon''s), including the herbivores. Tiny convinces Cindy that she and her siblings are no threat, and they eventually become friends.
78	** {{Downplayed}} with Vlad ''Volaticotherium''; while he's much more confident than Cindy, he explains to the 'saurs in his debut episode ("Haunted Roundhouse") that most mammals are nocturnal so they can hunt for insects without being disturbed by the "big scary dinosaurs".
79	** Averted with the other mammals, who aren't scared of dinosaurs at all.
80	* ''WesternAnimation/{{Futurama}}'': Discussed in "A Clockwork Origin". The crew gets attacked by robotic versions of dinosaurs, other Mesozoic reptiles, and a ''Dimetrodon'', which are then wiped out by a solar flare bringing out an electric surge that short-circuited them. The Professor proclaims that "only puny mammal-like robots cowering in caves could survive such a catastrophe", just as Bender comes out of a cave annoucing that he had taught himself to knit during the time.
81	* ''WesternAnimation/TheLandBeforeTime'' TV series: In the episode "Stranger From the Mysterious Above", Spike encounters a colony of ''Ceratogaulus'' or horned gophers ([[AnachronisticAnimal which are actually from the Cenozoic, not the Mesozoic]]) that mistake him for "The Big Wise One" from their legends. They later ask him if he could deal with the "Great Hideous Beast" that's been terrorizing them... which turns out to be a ''Microceratus'' not much bigger than them or Ducky.
82	* ''WesternAnimation/TheSimpsons'': One CouchGag depicts the evolution of Homer, starting from a single-celled microorganism and ending with his modern self. His counterpart from the Mesozoic is a small rat-like mammal who is hunted by a ''T. rex'' that resembles [[Characters/TheSimpsonsBartSimpson Bart]]. The chase ends with Homer hiding in a hole, enabling him to not only escape the predator but also to survive the meteor that wipes out all dinosaurs.
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85	[[folder:Real Life]]
86	* Generally speaking this trope has ''some'' truth to it, but this isn't to say mammals were all meek prey species. The End-Permian extinction event was a significant blow to Therapsid [[note]](the family of animals mammals belong to)[[/note]] diversity and the following Triassic Period saw Archosaurs [[note]](the family of animals dinosaurs, pterosaurs, and crocodilians belong to)[[/note]] largely surpass Therapsids for the megafauna roles by the end of the Period. Archosaurs being more efficient at larger sizes for various reasons meant the predecessors to and the eventual true mammals in the Mesozoic Era just couldn't successfully compete with them for ecological niches larger than around badger size. Broadly speaking, mammals actually did manage a respectable diversity in small forms across the Mesozoic which would go on to found the various families we see today after the End-Cretaceous extinction; it's just they didn't start achieving large sizes until after the Mesozoic.
87	** In fact, one of the common subsets of this trope, portraying human ancestors in the Mesozoic as shrew-like, does have some validity. Molecular research showing when lineages diversified implies that the earliest primitive primates, likely resembling modern tree shrews or mouse lemurs, were probably around in the later stages of the Cretaceous Period.
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Context Main / MeekMesozoicMammal