Many of the Muppets are pretty easy to pin down, species-wise. Kermit is a frog. Fonzie is a bear. Miss Piggy is, obviously, a feisty piggy. But Gonzo—with his blue-ish fur, bulging eyes, tuft of purple feathers, and long, curved nose that looks a little like a beak—is something of an enigma. The writers of the Muppets have avoided the question of what Gonzo is for years.

Well, in a new episode of Popular Science ’s Ask Us Anything podcast , we asked three biologists to break down exactly what Gonzo is. We also talk to Muppets legend and Gonzo performer Dave Goelz to get his take.

Ask Us Anything answers your most outlandish, mind-burning questions—from the everyday things you’ve always wondered to the bizarre things you never thought to ask. So, yes, there’s a reason candy tastes different now and no, you don’t need to worry about Yellowstone’s supervolcano blowing up anytime soon . If you have a question for us, send us a note .…