Seeing through the Glass Frog (Centrolenidae) (18 Pics)

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The glass frog (family Centrolenidae; order Anura) is one of those bizarre and fascinating creatures in this world. Upon looking down at this amphibian, the first thing you might notice is its soft lime-green color. But if you were to turn him over, a quick glance at his abdomen would catch your attention. The glass frog’s stomach is completely transparent! Close examination of this unique creature reveals a fully visible system of organs, including the heart, liver, and full intestinal tract. Scientists believe that earlier frogs of this species evolved to have this trait for camouflage; while perched on a leaf or branch, they are extremely difficult to spot from a distance.

Source: http://www.factzoo.com/amphibians/glass-frogs-see-through-transparent.html