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This is Scientific American's 60-second science. I'm Christopher in Taliatta.

You might think frogs catch insects because their tongues are sticky.

But why is the tongue sticky?

And how does it actually adhere to these insects at these very high accelerations?

Those are the questions Alexis Noel, a PhD candidate in mechanical engineering at Georgia Tech, wanted to answer.

So she and her team got frog tongues from a dissection lab, as one does, and tested their consistency, 10 times softer

than human tongues, a texture more like brain tissue. Their tongue is very much like a sponge. It actually

is infused with this very thick, very viscous saliva.

That saliva was their next study subject.

And in order to test the saliva, we had to get about a fifth of a teaspoon of fluid, which is a lot of saliva in a frog's case.

They put the saliva in a rheometer, a tool that can measure viscosity.

And they found that frog saliva is what's called

a sheer thinning fluid. Its viscosity changes depending on conditions. You might be more

familiar with a different sheer thinning fluid. Catchup. When you smack the bottom of the

ketchup bottle, you're actually invoking sheer forces within the ketchup itself. And the ketchup, because it's sheer thinning, its viscosity

actually drops and allows it to slide out of the bottle easily. So back to our frogs. The tongue

shoots out, hits the bug, and deforms around it. That impacts like a smack on a ketchup bottle.

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