Wednesday, October 20, 2010
The slow-moving mystery of the sloth's neck
Sitting quietly on a tree branch in South America, brown-throated sloths don't do much – except break a law of mammalian evolution.
The slow-moving mystery of the sloth's neck
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Sitting quietly on a tree branch in South America, brown-throated sloths don't do much – except break a law of mammalian evolution.
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