In answer to Art Mudge's question:
The British are much more concerned about the decline of House Sparrows than we are, so most of the research has been done in Britain. Here are just a few references. The first is a PhD thesis with links to other articles. The second is an article in the "Guardian". The third gives a little background. I don't think there is a really definitive answer yet, but there are some plausible suggestions for the decline. More study is needed and is continuing.
http://www.katevincent.org/http://www.guardian.co.uk/environment/2008/nov/20/wildlife-endangeredspecieshttp://www.birdsofbritain.co.uk/bird-guide/house-sparrow.asp
Joanne Norton
Kendal at Hanover
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