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Sexual dimorphism in body size and mating system.

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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