Most mammals have 7 neck vertebrae. Tree sloths and manatees are the only mammals that defy this rule. Manatees only have 6 vertebrae in their necks, while sloths have up to 10.
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Most mammals have 7 neck vertebrae. Tree sloths and manatees are the only mammals that defy this rule. Manatees only have 6 vertebrae in their necks, while sloths have up to 10.