Beavers impress us. Their building skills surpass some human’s building skills, and you can’t help but admire their wide tails and determined attitude. They work day in and day out to build dams for their families, which makes them seem like friendly, hardworking animals. But they’re much more dangerous than you think. Those tails that help them build those expert dams are a warning sign for humans. If a beaver believes you’re getting too close, it’ll vigorously slap its tail on the water to get rid of you. If you do get too close, you better watch out for those sharp teeth he’s certainly not afraid to use (via Best Life Online).