Translucent Glass Frog Hide Blood Sleeping
Frogs at Chernobyl are turning black, while translucent glass frogs have always had the ability to hide their blood when sleeping to camouflage themselves from predators. How so? When these tiny amphibians are sleeping, they hide nearly 90% of their red blood cells in their liver and also shrink most of their organs inside their body.


Translucent Glass Frog Hide Blood Sleeping
Photo credit: Jesse Delia/AMNH via AP
What might surprise you to know is that when these glass frogs are awake, stressed or under anesthesia, their circulatory system are full of red blood cells and they are opaque. The only way to study their transparency is when they are happily asleep, which is a difficult scenario to achieve in a research lab. So, they ended up having these glass frogs sleeping upside down in a petri dish, similar to how they would sleep on a leaf, and the team then shined a green laser at the amphibian.

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When glass frogs are resting, their muscles and skin become transparent, and their bones, eyes and internal organs are all that’s visible. These frogs sleep on the bottoms of large leaves, and when they’re transparent, they can perfectly match the colors of the vegetation,” said Carlos Taboada, a post-doctoral fellow at Duke and a co-first author of the paper.

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