Have you ever wondered: "How many bananas can I eat in 60 seconds?"

Probably not. But Jack Hanna has!

After watching a Mandrill ape stuff its face with seven bananas in less than 60 seconds, Hanna, the director emeritus of the Columbus Zoo & Aquarium in Ohio, had to give it a shot himself.

He decided to put himself to the test while on the "Late Show with David Letterman" last week.

He hoped to down three bananas just like the ape, by stuffing them in his cheeks.

Watch the video to see how Jungle Jack fared!