○○○dredge⪢⪢
They dredge mud from the pond bottom to seal the dam. Each pond trap several inches of sediment every year. So there's plenty of it.
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○○○keystone species⪢⪢
Beavers are keystone species wielding an oversized influence on their surroundings. They build dams which filter water, flood rivers and create crucial wetlands.
→ wield
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○○○lodge⪢⪢
Beavers are easily recognized by their broad flat tails and are well known for the dams and lodges they construct.
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○○○log⪢⪢
The pond makes it easier to move around the heavy logs they need to build the dams. Out of the water it's a struggle.
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○○○nutrient⪢⪢
In the Rocky Mountains beaver dams slowly filter billions of tons of water. The ponds build up soil and nutients and help prevent floods and droughts.
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•safe haven
And they cut back trees and bushes opening up forest canopies and promoting the growth of heavy underbrush which provides a safe haven for many other animals.
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