In the first broad evolutionary analysis of its kind, Chloe Heys and her colleagues found that masturbation appears across ...
Unlike most mammals, birds generally do not possess external genitalia. They reproduce through the cloaca, a multi-purpose ...
A new evolutionary study reveals that masturbation is common among bird species and is a natural part of avian biology. Researchers say the behaviour is widespread, healthy, and not a sign of stress ...
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