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http://www.msnbc.msn.com/id/15819025/

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Scientists have discovered pseudo-sex in crayfish, where males fake sex with each other to show dominance and reduce violence. Without it, these males often killed each other.

The use of "pseudocopulation" to establish hierarchies and ease aggression among males is also seen in mammals such as primates. This is the first time scientists have seen such a complex dominance ritual outside vertebrates.

Neuroethologist Donald Edwards of Georgia State University in Atlanta and his colleagues investigated Louisiana crayfish in a lab aquarium. Scientists had seen pseudocopulation between males in the wild and in captivity, but why this happened was unknown.
Not unlike frat boys...
 
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