Objective: Class Reptilia

Important Terms

Body Heat• Ecotherms

– Environmental heat is main source of body heat

– “cold blooded”– Reptiles, amphibians

• Endotherms– Cell metabolism is main

source of body heat– Mammals, birds

Class Reptilia

• Turtles, snakes, lizards, crocs, gators

- Amniotic egg• Waterproof with shell• (Reptiles, birds,

mammals)

CHARACTERISTICS:– Skin made of keratin– Have scales

Characteristics

• Lay eggs– Internal fertilization– External development

• Lungs to breathe• Molt

– Scales do not grow

Turtles• Order Testudines• Shell

– protection

• Jaw – No teeth

Lizards and Snakes

Order Squamata

Lizardstail, scaly skinWarm environments

SnakesWarm environmentsSome are venomous

Crocodiles and Alligators

• Order Crocodilia• 4-chambered heart• Highly developed brain• Complex social behavior

Differences between Crocs and Alligators

Class Aves

• Wings– Shaped to provide lift– Feathers: modified scales

• Insulation and flight

• Respiration– Lungs that support high level of oxygen

• Bones– Hollow

• Absent organs for reduced weight (1 ovary, toothless, no bladder)

Anatomy

• gizzard: grinds food• crop: organ to store

food temporarily• 4-chambered heart

– Separate ventricles– Efficient

Behavior

• Proportion of brain to body is second largest

• Care for offspring• Territoriality