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Updated: May 2, 2025
Sclater, in a paper read before the Zoological Society of London, June 17th, 1873, stated that in the South and Central American species of Crax there is a complete gradation from a species in which the sexes scarcely differ, through others in which they differ more and more, until in Crax globicera they are quite distinctly coloured, and have been described as different species.
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