Most animals would die if they tried this.
Now you see them, now you don’t.
But when northern glass frogs wake up and hop around in search of insects and mates, they take on an opaque reddish-brown color. Using light and ultrasound imaging technology, the researchers discovered the secret: While asleep, the frogs concentrate, or “hide,” nearly 90% of their red blood cells in their liver.
The research “beautifully explains” how “glass frogs conceal blood in the liver to maintain transparency,” said Juan Manuel Guayasamin, a frog biologist at University San Francisco of Quito, Ecuador, who was not involved in the study.
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