Phantom Limbs

Salamanders can grow back lost limbs, and scientists have now discovered
that immune cells are the key to this regeneration, taking us a step closer to being
able to heal human tissue in the same way. The researchers found that cells known
as macrophages are crucial to the salamanders' unique healing abilities, and could
one day help treat spinal cord and brain injuries in humans.

More here: www.sciencealert.com

Darwin’s Frog

The male Darwin’s frog broods tadpoles in its mouth. They tend to get frisky
as children often do. He carries them around until they develop into froglets
and hop out of his mouth.

The Transparent Glass Frog

 
 'Glass frog' is the common name of frogs in the amphibian family Centrolenidae. There are many species, and they are found throughout Central and South America.

As you can probably guess. their name comes from the obvious fact that many of the members of this family have translucent skin. Many internal organs including the heart, liver and gastrointestinal tract are visible.