"It's a birdcage..."

The Jurassic Park films famously depict Pteranodon among the token non-dinosaur prehistoric creatures. The ones that appear Jurassic Park III lack the downy covering many pterosaurs had, have leathery wings and toothed beaks (ironically, the very name Pteranodon means "toothless wing"), and are able to carry off a teenager with their talon-like feet; they also construct bird-like nests, and the young are also less flight-capable than they should be and are unrealistically aggressive. The junior novelization of the movie states that the Pteranodon were genetically altered to be more monstrous and impressive and are not the genuine prehistoric animal.

Example of:
Terror-dactyl