2 P2 Living on LandReptiles were the first animals to live on land.
3 P2 Characteristics of Reptiles Lungs, thick skin, use surroundings to control temperature, egg that is laid on land.P3 Thick SkinWatertight—does not allow water to escape to keep cells from losing water by evaporation.
4 P3 The Amazing Amniotic Egg P3 Body TemperatureEctothermsActive when warm andslow down when it is cooloutside.P3 The Amazing Amniotic EggAmniotic egg: an egg thatholds fluid that protectsthe embryo keeping theembryo from drying out.
5 P3 Parts of the Amniotic Egg The parts of the amniotic egg are the shell, albumen,amniotic sac, yolk, and the allantois.P3 Reptile ReproductionReptiles reproduce by internal fertilization.A shell formsaround the egg andthe female then laysthe egg.Do not gothroughmetamorphosis.
6 P2 Kinds of Reptiles P3 Turtles and Tortoises Turtles and tortoises, crocodiles and alligators, lizards and snakes, and tuataras are the four groups of reptiles still alive today.P3 Turtles and TortoisesTortoises live on land.Turtles spend much or all of their lives in the water.Sea turtles, however, lay their eggs on land.The hard shell makes them slow and inflexible but unique.
7 P3 Crocodiles and Alligators Spend most of their time in the water.Eyes and nostril located at the top of their head.Meat eaters: eat invertebrates, fish, turtles, birds, and mammals.Crocodiles have a narrow head and a pointed snout.Alligators have a broad head and a rounded snout.
8 P3 Snakes and Lizards Snakes Lizards Carnivores Special organs in the mouth to smell prey.Swallow prey whole.LizardsMost eat small insects and worms.Loosely connected lower jaw but will not swallow large prey whole.Can break off their tail to escapepredators and thengrow a new one.
9 P3 Tuataras Live only on a few islands off the coast of New Zealand. Most active at low temperatures.No visible ear openings on the outside of the body.