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 ...

Even a "bad" tree is not a hazard tree if it has no significant target to hit. Remove a tree with a large cavity when it has a stationary target that is constantly occupied, such as a house.

QUESTION: We have a healthy live oak that has developed a small pocket where two limbs come together. Water collects in the cavity, and it looks as if the area is starting to rot. Should I fill it … ...

Bluebirds nesting in tree cavity in swamp. An unusual place for that species. By jim williams. May 15, 2012 at 2:11PM (The Minnesota Star Tribune) Comment. Gift. Share. Listen.

One of the services the primary excavators provide is when they stop using their cavity, someone else moves in — a secondary cavity nester, like a bluebird, tree swallow, house sparrow or ...

Called obligate secondary cavity nesters, these are species that build their nests in pre-existing cavities in tree trunks, fence posts or rocky outcrops.