More on the status of the Bank Swallow, which is declining across a very large geographic area: see the links below for additional detailed information, but first these more general references about the "aerial insectivores":
http://www.bsc-eoc.org/download/BWCwi08.pdf
http://www.ace-eco.org/vol5/iss2/art1/
http://www.nhaudubon.org/wp-content/uploads/2010/11/Afield-spring-2012-web.pdf
and refer back to my last post to see atlas maps compared between Atlas 1 and Atlas 2:
http://futureofbirds.blogspot.com/2016/08/bank-swallow-how-thhings-have-changed.html
Bank Swallow is strongly declining in many Canadian provinces:
http://www.registrelep-sararegistry.gc.ca/species/speciesDetails_e.cfm?sid=1233
http://www.manitobacooperator.ca/country-crossroads/species-at-risk/
http://www.birdatlas.mb.ca/speciesatrisk/Species/BankSwallow/species.htm
https://www.ontario.ca/page/bank-swallow
In New Hampshire:
http://nhbirdrecords.org/all-articles/NH_Swallow_Fact_Sheet_21-Jun-10.pdf
In California:
http://www.bankswallows.org/
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