Not unlike frat boys...
|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.