nice of you to assume it was canadians doing this - then again - I bet you didnt know that they are one of canada's birds - they breed up here and only visit the usa during the winter months... if it wasnt for canadians.. your "national" bird would be dead.
http://www.pc.gc.ca/pn-np/ns/cbreton...cul1ciia_E.asp
http://www.hww.ca/hww2.asp?pid=1&id=27&cid=7