Why Do Animals Have Tails?

Jessi and Squeaks got another science question from one of their viewers! Why do animals have tails and we don't?

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SOURCES:

https://www.washingtonpost.com/lifestyle/kidspost/ever-wonder-why-animals-have-tails/2012/10/12/23c17198-b3d9-11e1-98e9-bbf4aa4074bb_story.html?utm_term=.8dfd9848f3cc
https://pursuit.unimelb.edu.au/articles/why-don-t-humans-have-tails
https://www.scienceabc.com/nature/animals/why-animals-have-tails.html
http://www.sciencefocus.com/qa/why-dont-we-have-tails