The greatest diversity of killer whale forms–or possible (sub)species – is in the Antarctic. One reason may be because killer whales originated in, or near, the Antarctic, which would also explain their large size - an example of Bergmann’s rule... continue reading
The females of many animals may assess the fitness and health of males via displays or physical features, such as the tail of a peacock [http://en.wikipedia.org/wiki/Signalling_theory]. Physical features may be a “handicap” that fit males can... continue reading
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