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This is scientific American's 60 second science.

I'm Christopher Intagata.

Ravens are known for their exceptional intelligence.

In fact, they're sometimes referred to as fly. are known for their exceptional intelligence.

In fact, they're sometimes referred to as flying primates.

We knew they are very smart,

but nobody ever had really tested this using big and comprehensive test battery which also then really

enabled us to say is the cognitive performance similar to those of great apes or

nots? Zimon Peika is a cognitive scientist at the University of Osnabrook in Germany.

She and her colleagues wanted to see how ravens would measure up to primates across a wide array of tasks.

So they subjected eight ravens to something called the

primate cognition test battery. It's a series of 33 different tasks designed to

assess various aspects of intelligence among primates.

For example, one test is a game of cups.

You may have seen it affair.

You put an object under one of three cups,

move the cups around, and then guess which cup the object's under.

Other tasks tested the raven's ability to determine cause and effect

or to understand different quantities.

...