You probably know that frogs hop (  ). But did you know that there's a small frog in the Pacific Northwest that bellyflops ? It's called a tailed frog. Dr.Rick Essner, who has been studying tailed frogs for the past few years, says, " I've looked at thousands of jumps and have never seen them land on their feet like other frogs." Most of the time, tailed frogs land on their stomachs and then bring their back legs in to prepare for another jump. Essner forst noticed these frogs because of the way they swim. Other frogs kick both of their back legs at the same time. But when a tailed frog swims, it pushes first with one leg and then the other. To try to find out why tailed frogs bellyflop, Essner and other scientists collected and filmed different kinds of frogs. They found that all of the frogs start their jumps the same way: they hold out their legs. The change comes in the landing. Tailed frogs can't move their back legs as quickly as other frogs do. Maybe they don't need to. Tailed frogs live around water and quickly jump into the water to escape danger. Early frogs developed around watery areas and could jump quickly into the water to escape danger. Scientists think those frogs blended in with (...) the green plants on the side of the rocky rivers, just like today's tailed frogs. "Iwould guess that other animals would have problems _ them, " explains Essner. When other animals find those early frogs, the frogs could jump into the river. They didn't need to continue hopping. Tailed frogs and other kinds of frogs went their own ways about 200 million years ago. Tailed frogs stayed by rivers. Other kinds of frogs moved to places where new hopping skills allowed them to survive. When they are in danger, the detailed frogs would   _  .
jump into the water for protection hop around quickly hide in the green plants near the river jump into the rock