Play is widespread, but far from ubiquitous, across the animal kingdom. Especially common in mammals, play is also known to occur in taxa as diverse as birds, fish, octopuses, and even insects. But ...
The chicks imprint on the hen and subsequently follow her continually. — Image by Otwarte Klatki (CC BY 2.0) The chicks imprint on the hen and subsequently follow her continually. — Image by Otwarte ...
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