Print References Field Guide to the birds of North America, 4th Edition by The National Geographic Society, Copyright © 2002 Field Guide to North American Birds, Eastern Region by The Audubon Society, Copyright © 1977, Eight Printing Field Guide to North American Birds, Western Region by The Audubon Society, Copyright © 1977, Tenth Printing Field Guide to North American Fishes, Whales & Dolphins by The Audubon Society, First Printing Field Guide to North American Insects & Spiders by The Audubon Society, Copyright © 1980, Second Printing Field Guide to North American Mammals by The Audubon Society, Copyright © 1996, Second Edition Field Guide to North American Reptiles & Amphibians by The Audubon Society, Copyright © 1979, Second Printing Guide to Common Freshwater Invertebrates of North America by J. Reese Voshell, Jr., Copyright © 2002, Third Printing Hawks of North America by Peterson Field Guides, Copyright © 2001, Second Edition Mammals of Texas by Texas Parks and Wildlife, Copyright © 1994