Sexual differences in sloths. J. G. Wagler article on sloths [Isis 24 (1831): 604–12].
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The Charles Darwin Collection
The Darwin Correspondence Project is publishing letters written by and to the naturalist Charles Darwin (1809–1882). Complete transcripts of letters are being made available through the Project’s website (www.darwinproject.ac.uk) after publication in the ongoing print edition of The Correspondence of Charles Darwin (Cambridge University Press 1985–). Metadata and summaries of all known letters (c. 15,000) appear in Ɛpsilon, and the full texts of available letters can also be searched, with links to the full texts.
Sexual differences in sloths. J. G. Wagler article on sloths [Isis 24 (1831): 604–12].
Encloses notes that illustrate apparent intelligent reasoning by a dog which tricked an adversary, and by an elephant peaceably enduring a painful operation.