Andrew Gallup, a psychologist and professor at the State University of New York, Oneonta, compiled a list of animals—elephants, cats, gorillas, sheep, camels, and walruses—and told his students to go online and find as many videos of these creatures yawning as possible, according to a report by The Atlantic.
The students gathered enough evidence to show that the size of an animal’s brains (not to the overall size of the animal itself or the size of its mouth) seemed to be directly related to the length of its yawn. So basically, if an animal yawns for a long time, you can safely assume it has a “heavy” brain.
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