Paleontologists working in Patagonia have unearthed the oldest-known fossil of a tadpole—and it was a whopper, measuring in at more than six inches long, the size of an adult human hand.

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When they start their lives as tadpoles, they have gills like fish, but when they grow up, they develop lungs. And that’s not all. A frog’s skin is so thin that it can actually absorb oxygen ...