Reptiles have a horny skin. Their eggs are fertilized internally and laid on land, enclosed in a leathery shell. They do not have a free-living larval stage. Some are viviparous, giving birth to live young.
Distinctive reptilian features are illustrated by the small stuffed crocodile and freshwater turtle and skulls of a freshwater turtle (Clemmys guttata) and a Green turtle (Chelonia sp.). The alligator brain (front) resembles the frog brain with respect to an enlarged cerebrum but its optic lobes are relatively smaller suggesting alligators rely less on sight to catch their prey.