The frog is one of the best example of how its skeleton and muscles have adapted to provide the best response to the natures challenges. Indeed, we will notice in the paragraphs below that each muscle and each bone has a well-determined function in providing for an excellent jumper and swimmer. In general, the skeleton is correlated with the moving function. Because of the frog's specific environment and the aquatic component it is dealing with, the skeleton of a frog refers to both swimming and leaping as kinetic modalities. The skeleton is, as such, adapted to perform these tasks.

             First of all, the tibia and fibula have joined to form the tibiofibula and it has specialized in providing an excellent leaping and jumping basis. Man has two lower leg bones, but it seems natural that for the frog, these two have joined together in order to provide for the best solution in the environment the frog lives. The muscles are also adapted to provide excellent jumping skills and to support the lower leg bones, the tibiofibula.

             Further more, the tibiofibula provides the best adaptation for swimming and thus covers the two main activities in the frog's life. In terms of swimming, if we look at a drawing of the frog skeleton, the tibiofibula provides the entire mechanical and energetic impulse required in swimming. If we compare this to the human tibia and fibula, we are bound to see the difference: the human lower leg is adapted to walking. The two separate bones provide the necessary equilibrium in different situation, as well as the strength to push into the ground when walking. .

             On the other hand, a frog's molded tibiofibula is a swimmer's mechanism. Besides providing enough strength for swimming, it also has the aerodynamic condition that permits a swift movement in the water. If the frog had two lower leg bones like the human, than it is likely that it may have moved slower through the water, because of the existing friction force.