Stupid Fact of the Day: The Disappearing Butt!

Scientists discovered an organism with a disappearing butt. The comb jelly—also known as the warty comb jelly, or sea walnut —has a disappearing butt.

Source: https://www.newscientist.com/article/2195656-animal-with-an-anus-that-comes-and-goes-could-reveal-how-ours-evolved/