Gorillas may have greater self-awareness than scientists previously thought. A new study finds that gorillas perform just as well as chimpanzees in tests that require awareness of their own bodies. A ...

A shrimp scrap drifted down the face of a mirror, and a small reef fish tracked it like it was watching a slow-motion experiment. The fish, a blue-streak cleaner wrasse, had carried the shrimp upward, ...

Before squaring up for a fight, some fish check themselves out in the mirror to make sure they're big enough. This strange behavior was seen in bluestreak cleaner wrasse (Labroides dimidiatus), who ...

In theory, a reaction to an out-of-place mark in a reflection is assumed to be evidence of self-recognition for other animals as well. Chimpanzees, elephants, and dolphins are just some that have ...

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 ...

Did David Graybeard, the chimpanzee who was first observed to use a tool by Jane Goodall, have any idea of who he was? Do elephants, dolphins, cats, magpies, mice, salmon, ants or bees know who they ...

Joining the likes of killer whales (Orcinus orca) and bottlenose dolphins (Tursiops truncatus), plus a number of primates, a common dark-furred mouse has passed what’s known as the mirror test, backed ...

One winter several years ago, I conducted one of my weekend retreats at a conference center in western Massachusetts. When I arrived, I heard about another retreat being offered there the same weekend ...