Special Operations Forces Center. 1  Fleet Week Jump with the Navy Leapfrogs Experience the Navy Leapfrogs' spectacular Fleet Week jump over San Francisco alongside the team, thanks to a handy helmet cam. Profile: 353d Special Operations Group The 353rd Special Operations Group is the focal point for all U.S. Air Force special operations in the U.S. Pacific theater.
Animals which Breathe through their Skin. Some animals which live on land have a skin which is so thin that gases can easily pass through it. We say that they have a permeable skin. Earthworms and amphibians have a skin which is permeable to gases. Amphibians also have a pair of simple lungs but they are not sufficient on their own for breathing. Large animals which breathe through their skin also use blood to transport oxygen to their tissues and to bring carbon dioxide to the surface of the body.
Some  amphibians have a rough leathery skin.  Reptiles are generally bigger in size than amphibians.  Reptiles include four groups of animals-lizards and snakes,  turtles and tortoises, crocodilians, and tuatara. Amphibians  include three groups of animals-frogs and toads, salamanders and  caecillians. Different species of reptiles live on land, in water, or both  on land and in water. However, all amphibians are born in water and  spend early part of their lives in water in form of larvae. Through  a process of metamorphosis the larvae of amphibians grow into  adults which are quite different from the larvae.