TIL that nearly all mammals, from mice to giraffes, have exactly 7 cervical vertebrae in their necks; the only exceptions are sloths and manatees.

Read more: https://ecoevocommunity.nature.com/posts/48312-on-the-backs-of-mammals-evolutionary-constraint-in-the-evolution-of-the-mammalian-vertebral-column#:~:text=Nearly%20all%20mammals%20have%20the,have%20exactly%20seven%20cervical%20vertebrae.

What do you think?

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