Yawning isn’t just for humans. Here’s why fish, birds and other animals yawn too, according to an expert.
Humans aren’t alone when it comes to yawning — all vertebrates do it too, including fish, amphibians, reptiles, birds and mammals. But why? The “evolutionarily ancient” act of yawning likely serves a few purposes, according to Andrew Gallup, a professor of behavioral biology at Johns Hopkins University. “The fact that it is conserved so widely across
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