The American Ornithologist's Union publishes a bimonthly series called The Birds of North America, each release featuring a different species. Inquire at your local public library, and university library concerning these publications, and others. Contact biologists working with state wildlife agencies, and those employed by the U.S. Fish and Wildlife Service. Many county governments employ biologists and do not overlook personnel at state and national parks, as well as national wildlife refuges. Natural history museums contain a wealth of research information and scientists who can answer your questions.
Universities conduct research year-round.
If the person you speak with is unable to answer you question, ask them to point you to someone who can. Local Audubon clubs and ornithology organizations are good sources of information concerning local species. The Internet provides unlimited contacts and resources. Do not limit your queries to local contacts. New York and California are as far away as your telephone.