The sloth may seem lazy, but its ancestors were anything but. In this video, evolutionary trade-offs reveal how energy ...
Crazy Creatures on MSN
Scientists reveal why the harpy eagle sits at the top of the aerial food chain
Harpy eagles are among the strongest birds on Earth, capable of capturing prey nearly their own size. Their enormous talons ...
Across the animal kingdom, some of the strongest creatures are also among the smallest. They don't rely on bulk to get things done.
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