| American Ornithology; or, The Natural History of the Birds of the United States. Plates Engraved and Colored from Original Drawings Taken from Nature. “Philadelphia Edition” with 103 hand-colored plates, 5 vols (3 text, 2 plates), complete. | Wilson, Alexander and Bonaparte, Charles Lucian | 447255 USD | — | — |
| Anatomical and Zoological Researches: Comprising an account of the zoological results of the two expeditions to western Yunnan in 1868 and 1875 | Anderson, John | 409984 USD | — | — |
| Venomous Snakes of Southern India | Sargeaunt, Captain C. C. | 282197 USD | — | — |
| Whales and Whaling in Japan, volume I, part 1 (all published), limited edition of 125 numbered copies | Hawley, Frank | 81997 USD | — | — |
| A Contribution to the Knowledge of the Avifauna of the Riu Kiu Islands and the vicinity | Kuroda, Nagamichi | 39934 USD | — | — |
| The Book of the Dead: Facsimiles of the Papyri of Hunefer, Anhai, Kerasher and Netchemet | Budge, E. A. Wallis | 37272 USD | — | — |
| Birds of the Island of Java, in 2 volumes | Kuroda, Nagamichi | 37272 USD | — | — |
| Observations sur les Tortues terrestres et paludines de Bassin de la Mediterranee | Lortet, L. | 34077 USD | — | — |
| The Turtles of New England | Babcock, Harold L. | 29817 USD | — | — |
| Indian Snakes: An Elementary Treatise on Ophiology with A Descriptive Catalogue of the Snakes Found in India | Nicholson, E. | 25558 USD | — | — |
| A Monograph of the Pittidae, or Family of Ant Thrushes (first edition) | Elliot, Daniel Giraud | 22000 USD | — | — |
| Handbook of the Birds of the World, volumes 1-11 (of 16) | Hoyo, Josep; Elliot, Andrew; Sargatal, Jordi et al. | 20979 USD | — | — |
| A Natural History of the Ducks | Phillips, John C. | 19701 USD | — | — |
| Historia naturalis Ranarum nostratium / Die naturliche Historie der Froesche hiesigen Landes | Roesel von Rosenhof, August Johann | 19500 USD | — | — |
| Red-crowned crane: Wang Keju’s photography works, Art Collection Jumbo Edition limited to 15 numbered copies signed by Wang Keju | Wang Keju | 19169 USD | — | — |
| Nests and Eggs of Birds of the United States | Gentry, Thomas | 18636 USD | — | — |
| Catalogue of the Specimens Illustrating the Osteology and Dentition of Vertebrated Animals, Recent and Extinct, Contained in the Museum of the Royal College of Surgeons of England, Part I: | Flower, William Henry | 17039 USD | — | — |
| Amphibians and Reptiles of Nepal | Schleich, H. Herman and Kastle, Werner (editors) | 14909 USD | — | — |
| Amphibians and Reptiles of Nepal | Schleich, H. Herman and Kastle, Werner (editors) | 14590 USD | — | — |
| Geophytic Pelargoniums: Field and Cultivation Studies of Pelargonium section Hoarea (the Collector’s edition of 25 numbered copies each signed by the author and artist) | Craib, Charles | 14377 USD | — | — |
| The Amphibians and Reptiles of Botswana | Auerbach, R.D. | 13844 USD | — | — |
| Mimetes: An Illustrated Account of Mimetes Salisbury and Orothamnus Pappe, Two Notable Cape Genera of the Proteaceae (limited to 500 numbered copies each signed by the author and artist) | Rouke, John Patrick | 13631 USD | — | — |
| The Birds of California. A Complete, Scientific and Popular Account of the Birds Found in the State, De Luxe Large Paper Edition, 4 volumes, complete | Dawson, William Leon | 13312 USD | — | — |
| Snakes of the Agkistrodon Complex: A Monographic Review | Gloyd, H.K. and Conant, R. | 12779 USD | — | — |
| Snakes of the Agkistrodon Complex: A Monographic Review | Gloyd, H.K. and Conant, R. | 12779 USD | — | — |
| Zoology of New York or the New York Fauna, Part II. Birds (hand-colored plates) | De Kay, James E. | 12779 USD | — | — |
| Contribution a l’etude Morphologique, Biologique et systematique des Amphibiens, Urodeles de la Chine | Chang, Mangven .L. C. | 10649 USD | — | — |
| A Chronicle of England: B.C. 55 – A.D. 1485 | Doyle, James E | 10649 USD | — | — |
| Agriculture of New York: Comprising an Account of the Classification, Composition and Distribution of the Soils and Rocks, and the natural Waters of the Different Geological Formations; | Emmons, Ebenezer | 9585 USD | — | — |
| Supplementary Notes on the Curassows now or once living in the Zoological Gardens | Sclater, P.L. | 8520 USD | — | — |