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• Turtles are toothless, but have a

beaklike structure to eat plants and animals