Fotografije su navedene prema redoslijedu pojavljivanja

American Museum of Natural History, New York, uz njegovo dopuštenje: 58.

Animals Animals/OSF, New York: 143; Animals Animals/Degginger, E. R.144 (1).

British Museum, London, uz njegovo dopuštenje: 210 (1), 213 (1) (2), 219 (1); Preneseno uz dopuštenje kuratora British Museuma: 210 (2), 213 (3).

Francuski nacionalni muzeji, Louvre, Pariz: 212 (2).

© 1982 Ira Block/THE IMAGE BANK, New York: 12, 13.

Kentucky Depertment of Travel Development: 67.

Land Management, Bureau of, Washington, D.C.: 69 (2).

National Aeronautics and Space Administration, Washington, D.C: 11, 128, 186 (2).

National Archives, Washington, D.C: 126 (1) (2), 224 (1), 225 (4).

National Park Service, Washington, D.C: 64 (1) Imuruk, Chukchi.

National Zoological Park, Washington, D.C: 4 (1) i 69 (4) Clymire, Brandy.

© Outdoor Pictures, Washington State: 54, 68.

Smithsonian Institution, Washington, D.C: 203 (Broj fotografije: 83-2259).

U.S. Fish & Wildlife Service, Washington, D.C: 3 (3) Biggins, Dean; 4 (2) Hartgroves, William; 63 (2) Biggins, Dean (3) Smart, Glen; 64 (2) Biggins, Dean, (3) Pfitzer, Dan; 68 (4) Hartgroves, William; 69 (1) (3) Biggins, Dean.

U.S Geological Survey, Washington, D.C: 225 (1).

Walters Art Gallery, Baltimore: 220.

World Health Organization: 224 (2) Cutting, W, 225 (2) Schwab, Eric.