Considering this True Facts video is about beavers, Ze Frank plows through it with an astonishing lack of sexual innuendo. Maybe he wants to be sure it will be picked up by external sites. Works for me. That said, it's quite interesting. Beavers are rodents, but you'd never know it by their behavior. They swim, eat trees, and build dams. Here we find out why and how they do those things, which includes taking a deep dive into the structure and composition of teeth. I now know more about horses' teeth because I watched a video about beavers. Yeah, there are jokes, but even without them, this would be interesting. There is a one-minute ad in the middle.