Information about the Flight Calls of Migratory Birds (Eastern North American Landbirds) CD-ROM and the Dickcissel night flight call monitoring project.
An association supported by federal, state, and regional governments dedicated to the preservation of bird species that summer in North America and winter in South America. Volunteer information and species data.
Data on North American birds, including the Breeding Bird Survey, Christmas Bird Count trends, migratory bird projects, the Bird Identification InfoCenter, checklists, ID tips, and quiz.