Beavers don’t eat hard wood or the whole tree like most people believe. Cambium produces a covering layer on the wood from which new wood and bark grow. The truth is, beavers don’t eat the wood itself;
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Do Beavers Eat Wood Or Just Chew It WHADOQ
They are basically eating the tree’s cambium layer by chewing on barks or branches and then spitting out the wood.
They eat a substance on the surface of the wood called cambium.