LEARN

Why the war started, how the Allies won, and why the world has never been the same

BBC Earth - Are birds as smart as mammals? Crow tool use (2 mins)

The hidden side of everything

The cleaner wrasse joins humans, chimpanzees, dolphins, and a select few other animals that can pass a long-standing intelligence test.

Researchers observed the cleaner wrasse trying to clean marks off itself and exhibiting signs of self-recognition while looking in a mirror. In doing so, the fish appears to pass the test for "mirror self-recognition," a test that has long been considered a hallmark of self-awareness in animals. Not everyone agrees.

Cleaner wrasse perform a cleaning service for coral reef fish -- namely eating parasites off their customer's skin. However, what the females of some species actually want is to lure in clients and 'cheat' them by biting off some tasty mucus before escaping.

The European magpie, a bird with a large brain and highly developed perspective-taking skills, shows evidence of mirror self-recognition.

Humans, it has long been thought, are the only animal to engage in economic activity. But what if we've had it exactly backward?

Cleaner wrasse perform a cleaning service for coral reef fish -- namely eating parasites off their customer's skin. However, what the females of some species actually want is to lure in clients and 'cheat' them by biting off some tasty mucus before escaping.

I think it might be George Clooney.

The Toilet An unspoken History

Borneo Death Blow - full documentary