Tree hollow
（重定向自Hollow bearing）
3708.jpg")
![Multiple tree hollows in a plane tree in Baden, Austria](/Images/godic/202501/18/Ancient_plane_tree_in_Baden,_Austria3708.JPG")
A tree hollow or tree hole is a semi-enclosed cavity which has naturally formed in the trunk or branch of a tree. These are predominantly found in old trees, whether living or not. Hollows form in many species of trees, and are a prominent feature of natural forests and woodlands, and act as a resource or habitat for a number of vertebrate and invertebrate animals.