In the new experiment, roosters made fewer alarm calls, meant to warn peers of predators, when placed in front a mirror versus when standing near another rooster. Stefano Spaziani / picture alliance ...

"Mirror mirror on the wall who's the fairest of them all?" Or, in modern language: Where's the closest mirror? I need to see if my hair is OK! You probably care about how you look when you approach ...

Daniel Povinelli was in high school when he first read about a clever experiment, published in 1970, that showed chimpanzees—but not monkeys--can recognize themselves in mirrors. "I bought into the ...

California two-spot octopuses learned to track prey they could see only as a mirror reflection, then moved toward the actual hidden location of the target rather than lunging at the glass. That ...

Cleaner wrasse have revealed a remarkable new side of fish intelligence. Marked with fake parasites, they used mirrors to inspect and remove the spots—far faster than seen in earlier tests. Even more ...