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Tree Swallows

Nest Box Residents : Out With The Old, In With the New

3-25-16  mouse nest in bluebird box by Jim LafleyDSC00362 (2)In order to prevent disease or the passing on of parasites, it is a good idea to clean out nest boxes after they’ve been occupied.  In the fall, after the last brood of eastern bluebirds or tree swallows has flown the coop, many nest box owners often clean them out in preparation for the next summer’s residents, but some wait until spring.  This habit of waiting provides white-footed and deer mice (and occasionally flying squirrels) with a ready-made winter shelter and/or larder.

Feathers incorporated into the pictured grass nest indicate that tree swallows once occupied this nest box.  After the last of the avian nestlings had fledged, mice moved into the box.  After constructing a roof over the nest, the mice succeeded in renovating the former bird nursery into a winter mouse house.  The remaining space inside the box served as a larder for nearby high-bush cranberries.

Unfortunately for the mice, but fortunately for the swallows or bluebirds that will reside here this summer, the responsible nest box owner dutifully cleaned out the nest box this spring, in accordance with avian-mammalian timeshare policies.  (Thanks to Jim Lafley for the use of his photo.)

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Tree Swallow Nestlings Well Fed

7-21 tree swallows 068Tree Swallow parents begin feeding their four to seven nestlings as soon as they hatch, and they continue doing so until their young depart the nest and sometimes for several days afterwards. The adult carries food in its bill and places it directly into the open mouth of a begging nestling. The small insects gathered by the parent may be formed into a rounded ball, or bolus, which they hold in their mouth or throat (often not visible to an observer). Both parents feed the nestlings, together averaging about ten to twenty deliveries per hour. During periods of peak nestling demand, parents may feed as many as 6,000 to 7,000 insects in a single day. (Thanks to Jeannie Killam and Terry Ross for photo op.)

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