Ectotherms Regulation Many ectotherms hide from predators at night because they are sluggish from lack of heat energy Others prey at night (mostly in hot climates) and stay out of extreme temperatures during the day

Ectotherm Regulation Ectotherms can also change color to help regulate their body temperatures. Darker colors absorb heat while lighter colors reflect heat.

Review 1.What is the distinguishing feature of ectohterms? – They regulate their internal temperature using the sun’s energy 2. Why is cold-blooded a cinfusing term to describe ectotherms? – Many ectotherms have warmer internal temperatures that endotherms.

Review 3. Which organisms have an easier time regulating their body temperatures, ectotherms that live on land or water? Why? – Those that live in water – Because water temperature is not as volatile as air temperature.

Review 4. What are some ways that ectotherms regulate their body temperatures? – Basking, burying, changing color

Reptiles Over 7000 species of reptiles The study of reptiles and amphibians is herpetology Herpo in Greek is “to creep or crawl” All reptiles have lungs and scaly skin

Reptiles Most reptiles shed their entire skin at once rather than one cell at a time like us!

Reptiles Scales protect the skin underneath from drying out Retiles have bone skeletons and most have teeth Their teeth range from blunt crushing teeth to thin needle-like fangs

Reptiles Many reptiles have a muscular, flexible, sticky tongue for catching insects.

Reptiles Reptiles generally have well developed organs. (snakes are deaf and some lizards don’t have eyes) Crocodiles and alligators have very advanced organ systems that have allowed them to thrive for millions of years.

Reptiles All reptiles reproduce through internal fertilization Some lay leathery eggs and the young are hatched Others store their eggs inside their bodies and the young are born live

Live birth

Reptiles Young reptiles look like miniature adults Most reptile mothers do not take care of their young

Common Reptile Groups 1. Turtles 2. Lizards 3. Snakes 4. Alligators and Crocodiles

Turtles Turtles’ bodies are protected by a shell formed of plates of bone Some shells can support a weight 200 X their own!

Turtles

Turtles are toothless, but have a beaklike structure to eat plants and animals