13.3 Birds meet their needs on land, in water, and in the air.

Vocabulary: endotherm, incubation

13.3 Review
1. Endotherms need to consume food to produce body heat.
2. Down feathers provide insulation. Contour feathers protect the body.
3. feathers; fused and hollow bones, air sacs, crop and gizzard, keen sight and hearing
4. Both birds and reptiles lay eggs with shells. Bird eggs have hard shells while the shells of reptiles´ eggs are flexible. Most reptiles do not incubate their eggs.
5. Flight requires a great deal of energy. If food was plentiful and there was little threat of predation, the birds may no need to fly.

Birdsnotes1

View more presentations from gueste25721.