Mother Nature can be a cruel mistress. For this list, we’re looking at the strangest, grossest, and most unsettling parts of the natural world. Our countdown includes Koalas Have Chlamydia, Leeches Can Grow to Be Huge, Cockroaches Are Nearly Invincible, and more! What do YOU think is the creepiest animal fact?

Check out our featured song: “Bleeding Heart” by Andrew De Leon! https://youtu.be/C3JhbyEECps