Tibia, fibula, and tarsals: transformed into one single very strong bone
Radius and ulna: transformed into one bone in order to absorb the impact from landing. 17 % from the mass of frogs are muscles that help for the jumping ability.
Urdolela (Salamanders): swimming or movement by their four legs.
Gymnophiona (Caecilians): have skull that has very hard fused bones helping the animal to move through the soil. There is a connective tissue that collects the power from the muscles in the body and sends it to the front in order to have greater power to break through the soil.
Mexican Burrowing Caecilian (Dermophis Mexicanus) : Caecilian family
Found in El Salvador, Guatemala, Honduras, Mexico, Nicaragua and Belize. It inhabits subtropical and tropical dry forests.
Mostly eats earthworms and other invertebrates with soft bodies. Also, small frogs, lizards, and blind snakes are discovered to be part of the menu of this creature.
The eyesight is very bad with these species, they have eyes that are so small that hardly could be seen and many experiments show that they don’t react to light changes at all.
As a whole, all Caecilians and Dermophis Mexicanus are very hard to be found because they live inside the soil, after heavy rains they can be observed on the surface in large numbers. They make their way through the soil by pushing with their head.
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Dermophis Mexicanus -." Wikipedia, the Free Encyclopedia . Web. 22 Mar. 2010.