Flying Squirrel. They will use bluebird boxes, but may enlarge holes. They may prefer boxes mounted on trees (on trunk or hanging) or telephone poles. Photos by Keith Kridler of TX. (The TX photos are probably Southern Flying Squirrels.)
Flying Squirrels have been known to prey on eggs, nestlings and adult birds in boxes. More.
Photo on left by Keith Kridler, below by Don Stiles of Canada.
A young flying squirrel (in a child's hand) found in an attic. It did not survive. Photo by Bet Zimmerman.
Photo by Keith Kridler.
Photo by Keith Kridler. The box is located on along a four lane highway.
Flying Squirrels will breed in a regular size bluebird nestbox, with up to nine young in one box (2-6 is more typical).
Flying Squirrel nest in two-holed box in TX, mounted on utility pole. Two adults were inside a box with a 4.75x4.75" floor. Material is inside a fiber cup from Jack Finch. It looks like stuffing/batting from bedding. Photo by Keith Kridler.
Bluebird nestbox filled up by Flying Squirrels in Texas. Box is located along a four lane highway. Photo by Keith Kridler.
Flying Squirrel (probably Southern) nest/roost in one of Linda Violett's two-hole mansions, hanging in a Sugar Maple tree on a grassy green (near forest) in northeastern CT, March 2008. Two adults were in this box. CT has both northern and southern flying squirrels. Photo by Bet Zimmerman.
The small photo above is in another of the two-hole mansions. A flying squirrel has occupied this box for two years. The photo is of the top of the nest - a flying squirrel was underneath the grass at the time.
A second Flying Squirrel nest/roost in a two-hole mansion, in 2007. This was early on. Notice tail in lower left hand corner. See 2008 video. So far I have only seen one adult in this box. Photo by Bet Zimmerman.
The student of Nature wonders the more and is astonished the less, the more conversant he becomes with her operations; but of all the perennial miracles she offers to his inspection, perhaps the most worthy of admiration is the development of a plant or of an animal from its embryo.
-Thomas Henry Huxley, British biologist and educator. Reflection #54, Aphorisms and Reflections, selected by Henrietta A. Huxley, Macmillan, 1907.
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