University of California
Ucmp: Aves Life History and Ecolog
University of California Berkeley offers a good discussion of the natural role that birds play and the importance of this role to man.
US Fish and Wildlife Service
U.s. Fish and Wildlife/agents Target Illegal Bird Trade
A good article on an issue that exemplifies man's exploitation of some bird species.
US Fish and Wildlife Service
U.s. Fish and Wildlife: Migratory Bird Treaty Act
A good article from the U.S. Fish and Wildlife Service on those birds that are protected by some legislation. Also includes some information on the hunting rules for several species.
CK-12 Foundation
Ck 12: Life Science: Importance of Birds
[Free Registration/Login may be required to access all resource tools.] You are probably familiar with birds as food. Around the world, people consume chicken, turkey, and even more exotic birds, like ostriches. Can you think of other...
Other
Feather Site: The Poultry Page
A good description of all of the different types of poultry that are raised in the U.S.
Other
American Egg Board/the Incredible Edible Egg Site
One of the major uses of birds by society is for food production. This site delves into our use of eggs.