Have you ever gone to the zoo and observed the monkeys picking each other? This is a well-documented, long-studied, instinctive behavior in primates (monkeys, apes, etc.) called the grooming response.

The study "puts to rest the doubts of same-sex behavior occurring naturally in nature," said senior author Vincent Savolainen, a biology researcher at Imperial College London. Rhesus macaques monkeys ...

COLUMBUS, Ohio – Have you ever wondered what kind of video content would most grab the attention of monkeys? A new study of long-tailed macaques suggests the monkeys seem to like some of the same kind ...