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(Image credit: Shutterstock) That s the implication of a new study on same-sex behavior in animals. Instead of asking why animals engage in same-sex behavior (SSB), researchers should be asking, Why not? the authors said.  If they re right, same-sex sex may not have evolved independently in different animals for adpative reasons. Instead, same-sex sex may have emerged very early in time and could persist simply because engaging in it doesn t cost animals much, evolutionarily speaking. Usually, when evolutionary biologists see a trait that s really widespread across evolutionary lineages, we at least consider the idea that the trait is ancestral and was preserved in all those lineages, said Julia Monk, a doctoral candidate at Yale University, who co-authored the new research. So why hadn t people considered that hypothesis for SSB?

Caitlin mcdonoughYale universitySyracuse universityJulia monkகெய்ட்லின் மக்டநயேல் பல்கலைக்கழகம்சிராகஸ் பல்கலைக்கழகம்ஜூலியா துறவி