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Sticking their necks out for evolution: Why sloths and manatees have unusually long (or short) necks
As a rule all mammals have the same number of vertebrae in their necks regardless of whether they are a giraffe, a mouse, or a human. But both sloths and manatees are exceptions to this rule having abnormal numbers of cervical vertebrae. New research shows how such different species have evolved their unusual necks.
Source: ScienceDaily