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You may find this resource helpful in identifying species in Canada....
http://canadianbiodiversity.mcgill.ca/en...
It could also be a Northern Ribbon snake which is a subspecies of garter snake....
http://en.wikipedia.org/wiki/Northern_Ri...
It's most likely an Eastern Garter Snake:
http://en.wikipedia.org/wiki/File:Easter...
http://en.wikipedia.org/wiki/Eastern_Gar...