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