For social animals, a collective yawn could be nature’s way of making sure everyone is on the same page — shaking off drowsiness or settling in for the night.
When Madsen yawned for puppies, they tended to settle down and sleep. And she wasn’t immune from the so-called behavior transfer.
“I remember coding these videos,” Madsen said. “It would make me extremely sleepy.”
©2013 Los Angeles Times
Visit the Los Angeles Times at www.latimes.com
Distributed by MCT Information Services