Image of p. 76-77 from Darwin's Descent of man, and selection in relation to sex. The illustrations depict the sexual differences in two hummingbird species, specificially in their colors and plumage.
Copyright:
The National Library of Medicine believes this item to be in the public domain. (More information)
Related Title(s):
Rewriting the book of nature, Hidden treasure, and Is part of: Descent of man, and selection in relation to sex; See related catalog record: 60820030R