Scientists have discovered the secret of how frogs found in South and Central America have the ability to turn themselves almost transparent, according to a report in the journal Science. During the day, these nocturnal frogs sleep by hanging underneath tree leaves. Their delicate, greenish transparent forms don’t cast shadows, rendering them almost invisible to birds and other predators passing overhead or underneath. But when northern glass frogs wake up and hop around in search of insects and mates, they take on an opaque reddish-brown color. “When they’re transparent, it’s for their safety,” said Junjie Yao of Duke University. When […]

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