National Geographic : 1963 Jun
The frog does not see his target as he nears it; his nose blocks the view from his retracted eyeballs. But if he is off course near the be ginning of his jump, he will sight the target with one eye or the other. Then his built-in homing mechanism takes over: He alters course by twisting his rear flippers, giving his body a little "English," and zeroes in. Frogs do not eat under water, as alligators and turtles do. But apparently they will swal low any food they can get into their mouths, provided it moves above water. Occasionally they vary their diet of insects with small tur tles, mice, sparrows, ducklings, and even smaller frogs. Whatever the prey, biologists have learned, it will become a target only if it moves. Otherwise the frog does not rec 796 From Launch to Splash, a Jump Lasts Less Than Half a Second Eight stages of this leap were recorded by the author in Dr. Harold E. Edgerton's lab oratory at the Massachusetts Institute of Technology. High-speed lights that flicker 20 times each second with a flash duration of 25 millionths of a second froze the mo tion-about 10 miles an hour. Twisting legs corrected the flight path and kept the am phibian on course. Dr. Edgerton's lights are so fast that they appear to stop a bullet on film. Chorus line of frogs in the laboratory is an illusion. Actually a single leaper struck these graceful poses in its mid-air flight.