You're thinking backwards! Environmentalists doing restoration work on former wetlands will often look for historical signs of where beaver dams had previously

You're thinking backwards! Environmentalists doing restoration work on former wetlands will often look for historical signs of where beaver dams had previously been and rebuild them. Beavers have a very keen sense for the ideal location to build dams. Estimated beaver populations was around 200 million before "beaver hats" became a craze of Europeans that led to populations being hunted down to less than 10 million. It's hard to understate how deeply landscapes in North America were shaped by beavers