Reptiles 1 Reptiles Coldblood vertebrates Dry scaly skin

Reptiles

1. Reptiles • • • Cold-blood vertebrates Dry, scaly skin Lay eggs with leathery shells Three chambered heart Live in wet or dry climates Born with lungs and maintain through life

2. Categories of Reptiles • Non-Living: Dinosaurs • Living: – (a) snakes and lizards – (b) alligators and crocodiles – ‘(c)’ turtles, – (d) tuatara (single species in New Zealand)

3. Snakes • No legs, no ear openings, and unmovable eyelids • Molting – shed skin (and eyelids) periodically • Most are non-poisonous • Found in many different types of environments

3. Snakes

4. Snake Senses • Can not hear and have poor vision • GREAT sense of smell (use tongue) • Heat detecting organs (sense prey)

5. Snake Snacks • • Meat eaters Swallow food whole Live or strangle/suffocate and eat dead Jaws become unhinged; throat is elastic

6. Lizards

6. Lizards • Four legs, ear openings, and movable eyelids • Shed skin periodically via molting • Most live in warm/hot and dry places • Chameleons, Komodo (310 lbs), iguanas, flying lizards

7. Crocodiles and Alligators • Found in shallow waters in tropical climates • Use tails to propel through water • Nostrils and eyes above water • FOUR chambered hearts

8. How to tell the difference? • Alligators – broad, rounded snouts • Crocodiles – narrow, pointed snouts; also, fourth tooth on the lower jaw is outside the upper jaw when mouth is closed

7. Crocodiles and Alligators

9. Turtles • Most have clawed legs (sea turtles-paddle shaped) • Two hard, bony shells that cover body • Vertebrae and ribs are part of shell • Some can pull head and legs inside of shell

10. Types of Turtles • Sea Turtles – live in the ocean

10. Types of Turtles • Sea Turtles – live in the ocean • Tortoises – live entire lives on land

10. Types of Turtles • Sea Turtles – live in the ocean • Tortoises – live entire lives on land • Terrapins – freshwater turtles which may venture onto land