Hanging out in the trees of Central and South America are some frogs with pretty unusual coloration. Which is to say, parts of them have no color at all. The
Milk Frog
Salamanders and Frogs Hide a Glowing Secret - The New York Times
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The see-through frog and 6 other transparent animals that are
Oophaga pumilio - Frogs & Co
Des animaux qui gagnent à être transparents - Strange Stuff And
Glass frog The transperant animal
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Pacman Frogs
Calling male Reticulated Glass Frog (Hyalinobatrachium valerioi