I just ran across a rather amazing creature known as the glass frog.  These tiny little doods have transparent skin along their abdomen that allows you to see all the internal organs.  Crazy.  It is amazing what mother nature can do. They are an endangered species, but apparently a recent scientific excursion to Ecuador uncovered more of these amazing little creatures along with some other oddities and never before scene species.

Glass Frog

While the general background coloration of most glass frogs is primarily lime green, the abdominal skin of some members of this family is transparent. The internal viscera, including the heart, liver, and gastrointestinal tract are visible through this translucent skin, hence the common name. Glass frogs are generally small, ranging from 3 to 7.5 centimetres (1.2 to 3.0 in) in length. The frog is known to eat its own young. They are green in color over most of their bodies, save for the skin along the lower surface of the body, which is translucent.