by National Audubon Society, Wil Tirion, National Audubon Society Staff
by Jonathan Poppele
by Roger W. Sinnott
by Tristan Gooley
by Ian Ridpath, Wil Tirion
by Donald Voet, Judith G. Voet, Donald J. Voet
by National Geographic, Maya Wei-Haas, James Trefil, Michael Greshko, Rachel Brown
by Mariner Books Staff
by Daniel B. Botkin, Edward A. Keller