How Smart Are Dolphins?

In 1985, three researchers on a dolphin-studying expedition got a little bored.

To lighten things up, one pretended to be Poseidon by placing a seaweed

garland on his head, and then throwing it into the ocean.

Moments later, a dolphin surfaced with the seaweed crowning her head. Sure,

this could've been a coincidence, but it's also entirely possible that the dolphin was

mimicking the scientist. That's because dolphins are one of the smartest animal species on Earth.

So, exactly how smart are they? Like whales and porpoises,

dolphins belong to the group of aquatic mammals known as cetaceans, who comprise 86