I work in beaver country and see many throughout the course of a year. They are aggressive! When you're invading their water space, you'll get notified by repeated (and loud) tail slaps on the water. I've had one encircle my canoe. I've even encountered many on land. They're much bigger than you imagine. They could easily take down a medium-sized dog.
Fun to watch them, but keep your distance.
I’ve seen many, but none up close. That 65 pounder is large.