In this blog post, I’m going to put my arborist hat on again. I’m going to discuss something that I’m sure just about everyone has seen; a large hole in a tree. Sometimes it is call a hollow. In arborist language, we refer to these as a cavity. In many cases, these are a result of some sort of damage, whether that damage is from lightning or high winds or animals. Many times, trees in an urban or suburban setting may have a cavity or a wound due to something caused by people.