1. Aves - Birds

2. What is a Bird?
•Feathers
•Endothermic
•4-chambered heart
•Scales on legs & feet
•Hollow & lightweight bones
•Well developed lungs with air sacs
•Ex: owl, eagle, duck, chicken, pigeon, penguin, stork, etc.

3. Evolution of Birds Birds are believed to have evolved from dinosaurs
similar to velociraptors.
Once classified as a bird ancestor, the Archaeopteryx
is now considered a branch that
is an off-shoot of the dinosaurs.

4. Bird feathers and bones
Bones are lightweight but strong.
Feathers protect and insulate.

5. Bird Anatomy

6. Bird Respiration
One-way airflow constantly exposes the lungs to oxygen rich air.
This helps maintain a bird’s high metabolic rate.

7. Bird Circulation
Birds are endothermic which means they generate their own body heat and maintain a fairly constant body temperature.

8. Bird Excretion
Uric Acid – a white pasty excretory substance what has most of the water removed from it.

9. Bird Brain
Well developed senses allow birds to coordinate movement for flight and do things like see in color.

10. Bird Movement
Large chest muscles attached to a long keel that runs down the front of a large sternum allows birds to flap wings.

11. Orders of Birds
Falconiformes
Galliformes

12. Orders of Birds
Anseriformes
Strigiformes

13. Orders of Birds
Columbiformes
Passeriformes

14. Orders of Birds
Piciformes
Sphenisciformes

15. Ecology of Birds •Birds can help pollinate flowers.
•Birds help control insect
populations.
•Chemical dumped in an
ecosystem can accumulate
in a food chain and
possibly affect species.