What your yawns have to say about your brain.

FOX's Krystin Goodwin explains:

Do you have a big yawn!?...

A new study suggests the longer the yawn the bigger the brain.

Scientists at the State University of New York in Albany studied various mammals, tracking the animals brain weight, then calculated the length of each mammal's yawn.

They say long yawns bring a rush of blood to the brain releasing oxygen and helping the brain tissue to cool off.

Researchers found despite horses, camels, gorillas and African elephants all being much larger in size than humans, they have shorter yawns than we do.

It makes sense because these animals have smaller brains than ours.

I'm Krystin Goodwin, FOX News.

Follow Krystin Goodwin on Twitter: @Krystingoodwin