Monkeys using stones to crack open nuts generate many stone flakes accidentally that look exactly like the ones archaeologists have long thought early humans made intentionally as tools. Oops.
Two monkeys with spinal cord injuries were able to move after a wireless implant restored the connection between brain and legs. But any help for people will be years away, researchers say.
The isle of Cayo Santiago has been home to at least nine generations of rhesus monkeys since the colony's founding in 1938. Primatologists here seek clues to primate kinship, cognition and ecology.