Drey
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A drey is the nest of a tree squirrel, flying squirrel or ringtail possum. Dreys are usually built of twigs, dry leaves, and grass, and typically assembled in the forks of a tall tree. They are someti
Drey in Rome, Georgia, US
Eastern gray squirrel (Sciurus carolinensis) drey
Sign for the "Squirrel's Drey" pub in Sporle, Norfolk, UK
Two squirrels in the entrance of a drey
Tree hollow
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A tree hollow or tree hole is a semi-enclosed cavity which has naturally formed in the trunk or branch of a tree. They are found mainly in old trees, whether living or not. Hollows form in many specie
A naturally formed tree hollow at the base of the tree.
Multiple tree hollows in a plane tree in Baden, Austria
Indian spotted owlet in tree hollow
Hollows excavated by the lesser spotted woodpecker (Picoides minor). Also fungus, which may also help in the formation of hollows through the decomposition of heartwood.