• The National Audubon Society
• The Indiana Audubon Society
• The Nature Conservancy
• The Sierra Club
• Greenpeace
• United States Environmental Protection Agency
• Peterson Online
• The Virtual Birder
• Bird Identification Guide (Pautuxent Wildlife Research Center)
• BIRDNET
• IN-BIRD
• Cornell Laboratory of Ornithology
• Soarin' Hawk Raptor Rehabilitation (Leo, IN)
• Birds of Prey Foundation
• Indiana Natural Areas from GORP
• E-Magazine
• The Beaver
• Butterflies and Moths

Some sites that are particularly attractive for children:

• Ranger Rick
• National Geographic Kids
• Bat Conservation