1. Birds

2. Birds Reptile like animals Maintain constant internal body temperature
Endotherm- control body temp using metabolism
Outer covering of feathers
2 legs covered in scales
front limbs modified into wings

3. Groups of birds Almost 30 different orders, most common
Birds of prey ( raptors)
Perching birds ( songbirds, sparrows, crows, cardinals)
Cavity nesting birds (woodpecker, toucans, etc)
Herons and relatives ( storks, herons, cranes, etc)
Parrots ( macaws, lovebirds, cockatoos)
Pelicans (pelicans, boobies, cormorants)
Ostriches ( ostriches, emus, etc)

4. Flight
Highly efficient digestive, respiratory, and circulatory systems
Aerodynamic feathers and wings
Strong chest muscles

5. Feeding Beak size/ shape based on feeding material
Lack teeth therefore uses crop to store food and gizzard to grind food
Esophagus- crop- stomach –gizzard- small intestine-large intestine- cloaca

6. Respiration
unique and highly efficient: one way airflow to ensure oxygen rich air always reaches lungs
Air sac to lungs

7. Circulation
4 chambered heart with double loop system

8. Excretion Response Excretion
Like reptiles, kidneys to uric acid, water removed white pasty solid in cloaca
Response
Well developed large brain compared to body size

9. Movement Reproduction
Flight: hollow bones
Reproduction
Internal fertilization
Amniotic eggs with hard outer shell