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| Description: (a) In monogamous species, such as these Manchurian cranes, Grus japonensis, males and females appear very similar. (b) In polygynous species, like white-tailed deer, Odocoileus virginianus, males are bigger than females and have large horns with which they engage in combat over females. (c) In polyandrous species, there is often sex-role reversal, as in the northern pipefish, Syngnathus fuscus. Males look after the developing young in a brood pouch.
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