Yawns, The Great Unifier

From hippos to hedgehogs to humans, everyone yawns. However, the yawn’s evolutionary purpose has yet to be empirically substantiated. Nevertheless, their montage across species is still fun to watch.

Savannah Cox
Savannah Cox is the Managing Editor of All That Is Interesting. She holds a Master's Degree in International Relations, and works as a reporter/producer for DNAinfo.
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