Presentation on theme: "P1 Reptiles Ch. 3 Section. 1. P2 Living on Land Reptiles were the first animals to live on land."— Presentation transcript:
P1 Reptiles Ch. 3 Section. 1
P2 Living on Land Reptiles were the first animals to live on land.
P2 Characteristics of Reptiles Lungs, thick skin, use surroundings to control temperature, egg that is laid on land. P3 Thick Skin Watertight—does not allow water to escape to keep cells from losing water by evaporation.
P3 Body Temperature Ectotherms Active when warm and slow down when it is cool outside. P3 The Amazing Amniotic Egg Amniotic egg: an egg that holds fluid that protects the embryo keeping the embryo from drying out.
P3 Parts of the Amniotic Egg The parts of the amniotic egg are the shell, albumen, amniotic sac, yolk, and the allantois. P3 Reptile Reproduction Reptiles reproduce by internal fertilization. A shell forms around the egg and the female then lays the egg. Do not go through metamorphosis.
P2 Kinds of Reptiles Turtles and tortoises, crocodiles and alligators, lizards and snakes, and tuataras are the four groups of reptiles still alive today. P3 Turtles and Tortoises Tortoises 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.
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.
P3 Snakes and Lizards Snakes Carnivores Special organs in the mouth to smell prey. Swallow prey whole. Lizards Most eat small insects and worms. Loosely connected lower jaw but will not swallow large prey whole. Can break off their tail to escape predators and then grow a new one.
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.