Transparent frogs can HIDE their red blood cells while sleeping

When tiny glass frogs turn in for the night, they're able to become transparent by hiding almost 90 percent of their red blood cells.

The colorful areas are tucked away inside the frog's liver, which can disguise the cells, according to a Thursday study in the journal .

During daytime hours, these spend their time hanging beneath tree leaves. At that point, their green-colored forms don't cast shadows, rendering them mostly invisible to potential predators.

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