From mackerel to monkeys, practically everyone has a tail...except humans and other apes. The reason we’re left out is because most mammals use their tails to balance while walking or running. But we apes crouch or walk upright, so we no longer need a tail to act as a counterbalance.

MORE ANIMAL SCIENCE CONTENT:
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How Dogs Sniff Out Seizures
https://www.youtube.com/watch?v=YWMeyk7A3l8&t=17s
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https://www.youtube.com/watch?v=dySSo44lwkg

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Why Humans Don’t Have Tails