Steve:
The House Sparrow vs bluebird comparison is a no-brainier, as HOSP aggressively compete with bluebirds for nesting cavities. According to the link in the original post, ECDO were not thought to be negatively affecting native species. That article was from 2014, so things may have changed since.  

Curiously,
Kathi 

Sent from iVan II, my iPhone
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