Books in Biology (sorted by popularity)
- The Wonders of Instinct: Chapters in the Psychology of Insects Jean-Henri Fabre 165 downloads
- Ducks at a Distance: A Waterfowl Identification Guide Bob Hines 160 downloads
- Darwinism (1889) Alfred Russel Wallace 160 downloads
- Our Common Insects A. S. Packard 160 downloads
- Darwin and Modern Science A. C. Seward 154 downloads
- Development of the Digestive Canal of the American Alligator A. M. Reese 152 downloads
- The Foundations of the Origin of Species Charles Darwin 149 downloads
- American Addresses, with a Lecture on the Study of Biology Thomas Henry Huxley 147 downloads
- Evolution in Modern Thought 144 downloads
- Darwin, and After Darwin, Volumes 1 and 3 George John Romanes 143 downloads
- Evolution: An Investigation and a Critique Theodore Graebner 140 downloads
- Species and Varieties, Their Origin by Mutation Hugo de Vries 137 downloads
- Parasiten der Honigbiene (German) Eduard Philibert Assmuss 135 downloads
- The Minds and Manners of Wild Animals: A Book of Personal Observations William T. Hornaday 135 downloads
- The Evolution of Man Scientifically Disproved in 50 Arguments William A. Williams 133 downloads
- Lectures on Evolution Thomas Henry Huxley 130 downloads
- Biology : A lecture delivered at Columbia University in the series on Science, Philosophy and Art November 20, 1907 Edmund B. Wilson 129 downloads
- Contributions to the Theory of Natural Selection Alfred Russel Wallace 128 downloads
- De l'origine des espèces (French) Charles Darwin 128 downloads
- On the Origin of Species Charles Darwin 127 downloads
- Life History of the Kangaroo Rat Charles Taylor Vorhies and Walter P. Taylor 123 downloads
- Essays on early ornithology and kindred subjects James Roxburgh McClymont 122 downloads
- The Dawn of Reason; or, Mental Traits in the Lower Animals Jr. James Weir 119 downloads
- Fathers of Biology Charles McRae 119 downloads
- Concerning Animals and Other Matters Edward Hamilton Aitken 118 downloads