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Question: We have a can of spray foam that says it can be used to fill cavities in tree trunks. There's a hole in one of our trees where a branch was removed -- it's about waist-high. The hole extends ...

The squatters, on the other hand (also called secondary cavity users), include a variety of other birds, small- to medium-size mammals, some snakes, tree frogs and insects, all of which depend on ...