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P1 Reptiles Ch. 3 Section. 1. P2 Living on Land  Reptiles were the first animals to live on land.

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Presentation on theme: "P1 Reptiles Ch. 3 Section. 1. P2 Living on Land  Reptiles were the first animals to live on land."— Presentation transcript:

1 P1 Reptiles Ch. 3 Section. 1

2 P2 Living on Land  Reptiles 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 Skin  Watertight—does not allow water to escape to keep cells from losing water by evaporation.

4  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.

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 Reproduction  Reptiles reproduce by internal fertilization.  A shell forms around the egg and the female then lays the egg.  Do not go through metamorphosis.

6 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.

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  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.

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.


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