This five part video series comes from a YouTube channel called “New England Forests.” It’s awesome. The guy films, edits, and narrates everything himself. He’s a total gearhead, so the footage is stunning, but I don’t think he always records audio, so he will sometimes use these canned, lowres sfx. That being said, he seems to witness every living thing that goes on at the pond, because it’s not just about beavers - it’s about the whole ecosystem that forms when a stream gets turned into a pond. You will learn a lot about ecology, and also about one guy’s ability to really make something happen with his spare time.