Good answer Bill. Thanks for sharing this equitable solution. 

Linda Orkin
Ithaca, NY

Sent from my iPhone

> On Mar 25, 2015, at 7:33 PM, Bill Mcaneny <> wrote:
> WE have about 16 nest boxes on poles around our field. Initially they were 
> for bluebirds, and then the tree swallows arrived.  Our strategy: the nest 
> boxes are erected in pairs: one for the bluebirds, one for the tree swallows. 
>  House sparrows may move into one box in a pair, but not both.  (They don’t 
> like house sparrows for neighbors either.) Same for tree swallows.  By the 
> time the bluebirds come around, there are still empty boxes to choose from.  
> Last year, at least 3 boxes contained bluebird families.  Fair enough.  Try 
> it, it may provide housing for everyone.
> Bill and Shirley McAneny, TBurg
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