Frogs use elastic power to boost jumps, according to New Scientist, 12 July, 2003, p21. Scientists have puzzled over the ability of frogs to leap long and high because their muscles don’t seem to be powerful enough. American scientists recently filmed frogs jumping and calculated the energy required to leap, and decided the frogs must store energy by stretching a tendon-like component in the leg muscles. When the tendon is released it recoils like a stretched piece of elastic and gives the frog an extra boost.
Editorial Comment: When boys use elastic materials to make slingshots with extra boost, that is considered a deliberate (if somewhat misused) creation. When frogs are found to have elastic boosted muscles, that is considered to be a random chance occurrence. Is there a problem with logic somewhere? (Ref. frogs, elastic, design)