Beavers fell trees and pack mud into dams that pond water upstream, spreading shallow wetlands where a narrow channel once ran.
Ponds trap sediment, raise water tables, and create habitat for amphibians, waterfowl, and fish that need slow water. When dams breach, meadows and new channels often remain.
A rodent engineer redraws hydrology. Beaver wetlands are living infrastructure that store water and biodiversity in places maps once showed only as blue lines.
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