Crabs trade sex for protection
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Female fiddler crabs mate with their neighbours in exchange for protection.
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The discovery of the sex-for-security trait helps to explain a surprising quirk: how it is that females defend their territory just as successfully as males despite their smaller claws. It is also the first known case of male and female neighbours teaming up to defend territory in any species, according to lead researcher Richard Milner of the Australian National University in Canberra.
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Additionally, apparently prostitution isn't unique to Fiddler Crabs, however:
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Females of other species trade sex for material benefits. Red-winged blackbirds do so for the right to forage on a male's territory, and Adelie penguins exchange sex for stones to build their nests.
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