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Freak of Nature: Sloth Has Rib-Cage Bones in Its Neck

• LiveScience

Unlike nearly every mammal that has seven vertebrae in its neck no matter how long or short its neck, sloths stand out as oddballs with up to 10.

Now it turns out sloths are part of the fold (sort of) — what seem like extra neck vertebrae actually come from the rib cage.

 

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