American Bird Conservancy Audubon of the Chicago Region American Birding Association American Ornithologist's Union Association of Field Ornithologists Bird Conservation Network Chicago Audubon Society Chicago Ornithological Society Illinois Audubon Society Illinois Ornithological Society National Audubon Society National Audubon Society, Chicago Wilderness Field Office Departamento del Medio Ambiente de Chicago Distrito de Parques de Chicago Biblioteca Pública de Chicago Departamento de Recursos Naturales de Illinois Departamento del Interior Servicio de Pesca y Vida Silvestre de EE.UU.: U.S.G.S., Centro de Investigación de Vida Silvestre de Patuxent: Birder.com Birding.com Birdwatching.com Birding/Wild Birds Birdsource National Bird-Feeding Society Chicago Botanic Garden Cornell Laboratory of Ornighology eNature.com Field Museum of Natural History GORP Birding Page Illinois Bird Page (pictures of rare Illinois birds) Illinois & Chicago Net-Birding Illinois Hotspots International Crane Foundation Journey North National Fish & Wildlife Foundation National Geographic, Chicago-Area Bird Watching North American Rare Bird Alert Partners in Flight The Peggy Notebaert Nature Museum Peterson Online The Purple Martin Society Raptor Research Foundation Satellite Tracking Threatened Species Wildbirds.com