Population Monitoring, Migration, Ornithology
Web sites that are hubs for population study projects, online migration monitoring, or the scientific study of birds

Article, "The Spread of a New Contagious Disease in a Mobile Host Population"
• First observed at feeders in Washington, D.C., in 1994, this disease, which causes House Finches' eyelids to crust over and close, is speading geographically, and to American Goldfinches.