Researchers unravel mystery of why and for how long animals, including humans, yawn -- Science & Technology -- Sott.net

© Rachel Claire from PexelsFollowing a painstaking, large-scale animal study, researchers in the Netherlands now claim that,
when it comes to yawning vertebrates, the larger and denser the brain, the longer the yawn.
In what could be considered the biological research equivalent of watching paint dry, the scientists collected data on 1,291 separate yawns by visiting zoos and poring over videos online, observing some 55 mammals and 46 species of bird.
"We went to several zoos with a camera and waited by the animal enclosures for the animals to yawn," says ethologist Jorg Massen, of Utrecht University in the Netherlands. "That was a pretty long haul."

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