Dinosaurs


A group of animals that have a hole in their hip sockets that allow their legs to point straight downwards.  This adaptation helped dinosaurs run quickly.

All dinosaurs are also sauropsids, tetrapods, amniotes, and vertebrates.  A T. Rex and a penguin are two examples of dinosaurs.  A crocodile is not a dinosaur because its legs go out to the side rather than straight down.


Dinosaur
Dilophosaurus, an example of a dinosaur.