“NO ONE should.” The photo in question, posted from an account titled Time Capsule Tales, showed Robin Williams smiling with a monkey balanced on his shoulder.

Photos of grinning chimps have long adorned greetings cards but are now being abandoned over animal abuse fears. The jovial cards often feature trained chimps seemingly smiling alongside a witty ...

The baby monkeys took naps during the sometimes-lengthy appointments. The researchers seemed to notice a trend, and Kawakami said they decided to "empirically examine the behavior." ...