The Living Reptiles
Order Chelonia: turtles (aquatic) and tortoises (terrestrial); marine turtles live in the ocean but must lay eggs on land;only reptiles with shell of plates or leathery skin; no teeth;
Order Rhynchocephalia: tuataras, 2 species New Zealand
Order Squamata: lizards and snakesunique: lower jaw not joined to skull, jaw hinge with 5 joints, paired copulatory organs in malessnakes lack legs, movable eyelids, external ears
Order Crocodilia: crocodiles & alligatorsalligators only in southern U.S. and China (endangered)only reptiles that care for offspring and that have 4-chambered heart (like birds)