• American Ornithologists' Union
• Bayou Bill's All Outdoors
• Birdingonthe.Net
• Chipper Woods Bird Observatory
• Cornell Lab of Ornithology
• Dover Publications (Keyword: Bent)

• Indiana Audubon Society
• National Wildlife Federation
• National Audubon Society
• The Nature Conservancy
• North American Bluebird Society
• Smithsonian Institution

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