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 The Amazing Amniotic Egg
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 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 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 Lizards 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.