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Re: Bird behavior question

House Sparrows use old Cliff Swallow nests(made of mud, with a hole at 
the bottom); in fact, they often drive the swallows out before the nests 
are old.  House Sparrows, an agressive introduced species, will use any 
cavity they can for a nest site.  As far as finches go, however, I've not 
heard of that behavior before. Would it be possible to get a specific ID 
on the two species involved?

Gary Bloomfield