It looks like Ze Frank has teamed up with Buzzfeed and the BBC. I’m not sure what this means in the long run, but right now it means that we’ll have two different True Facts videos for you this week.

This first one is about natures ball sack, the naked mole rat. It might be one of the ugliest mammals on the planet, but it is also one of the most highly adapted. Also, their nuts grow to be 9% of their total body mass when they are in heat. Imagine trying to walk around like that every time you got horny!