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PBS
The Extreme Hyenas That Didn't Last
Hyenas weren’t always able to eat bones. In fact, only a few million years ago, they lived very different lives.
SciShow
The Frog with Hidden Claws
A frog with retractable claws? Weird. A frog with claws that it has to push through its skin to use? Even weirder.
SciShow
The Frog with Hidden Claws
A frog with retractable claws? Weird. A frog with claws that it has to push through its skin to use? Even weirder.