Why are humans the only animals to wipe their butt? // TRAIN BRAIN

Why are humans the only animals to wipe their butt?

Humans are strange animals for many, many reasons. One of them is that we are the only ones to wipe our butt.
But why do we need this?

MinuteEarth

Science and stories about our awesome planet! Our staff: Lizah van der Aart, Sarah Berman, Cameron Duke, Arcadi Garcia, David Goldenberg, Melissa Hayes, Alex Reich, Henry Reich, Peter Reich, Ever Salazar, Leonardo Souza, Kate Yoshida and Jasper Palfree. ...

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