Jeff Smith wrote:
.....I have had no increase in sparrow activity and have seen no
aggressive behavior, not yet.
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Ooh, run--don't walk!--and fix that bird house. No perch, outer block as
suggested by Mike Patterson, etc., all help. But if sparrows can't enter
the hole, they may still sit on top of a nest box, and attack the
chickadees coming or going. If they don't kill the chickadees, they will
certainly disrupt their nesting in that box. Don't wait to see the
aggressive behavior, Jeff.

Good landlording!

Ellen B
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Ellen Blackstone Everything connects...
Seattle Washington absolutely everything.
mailto:ellenb at 123imagine.net --Hazel Wolf, 1898-2000