Chimps can't help yawning either

[Nagual]

Study finds behavior just as contagious as in humans

OKYO - Ai, a 27-year-old chimpanzee in western Japan, watches another chimp yawn, quickly rolls back her head and soon is showing the pink inside of her mouth in a gaping yawn of her own.

"It's another good example of how chimpanzees are so like us," said Tetsuro Matsuzawa, professor at the Primate Research Institute at Kyoto University who took part in the Japan-based study.

The study, published this month in the British online journal The Royal Society Biology Letters, says that out of six chimpanzees under observation, two clearly yawned repeatedly in response to videos of other chimps yawning.

http://www.msnbc.msn.com/id/5518753/