Why do animals have Tails?

How come Tails come in different sizes & shapes? Which animals rely on their Tails the most? Did Humans ever have Tails?  Grown-Ups: Be a better you in 2024 with Babbel, the science-backed language-learning app that actually works. Get 55% off at Babbel.com/SMARTED. Rules and restrictions may apply. Say hello to HelloFresh! Go to HelloFresh.com/smartedfree and use code: smartedfree for FREE breakfast for life! One breakfast item per box while subscription is active.