To try to figure out why tailed frogs belly-flop, Essner and other scientists collected and filmed different kinds of frogs.
While in the air, tailed frogs keep their legs stretched out.
The way the tailed frogs jump might explain why they are not graceful swimmers.
Tailed frogs live around water and swiftly jump into the water to escape danger.
Scientists think those frogs blended in with the moss on the side of the rocky streams, just like today's tailed frogs.