They might have some of the biggest brains in the water, but dolphins really aren't that clever after all, according to a scientist.
Paul Manger, from a university in South Africa, says they use their big brains to stay warm in the sea, rather than for lots of thinking.
He thinks dolphins learn so many tricks because they get rewarded with food.
He points out that while goldfish try to jump out of their bowls, dolphins are just too thick to think of escape.
Manger claims that the brain is made up of two types of cells - neurons and glia.
Neurons do the thinking, while glia do things like keeping the brain warm to help the neurons.
Brain structure
After looking at how dolphins' brains are put together, he claims dolphins have lots of glia and not many neurons.
That could be because they live in the water, and need lots of glia to keep their brains going in the low temperatures.
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