Tropical Nature and Other Essays (Classic Reprint)
Wallace, Alfred R. Excerpt from Tropical Nature and Other EssaysThe remaining chapters have all a more or less direct connection with the leading subject. The family of humming-birds is taken as an illustration of the luxuriant development of allied forms in the tropics, and as showing the special mode in which natural selection has acted to bring about considerable changes in a limited period. The discussion on the nature and origin of the colours of animals an...