One last point copied from the Kingbird ariticle where my reference to records 
of birds from the Ontario program:

The first reports of Trumpeter Swans (Cygnus buccinator) in NYS were of
wing-tagged birds at Dunkirk Harbor, Chautauqua Co., in the fall of 1988. Since
that time sightings have increased and breeding has been confirmed in at least
six locations. Most likely, these NY birds are derived from two sources: the
Ontario reintroduction program for this species, and a private reserve in Clyde,
Wayne Co., NY where unbanded fledglings have been allowed to roam freely
since around 1990. Although less likely, swans from reintroduction programs in
Ohio, Michigan, and Minnesota could also be a source for NYS birds.
According to the DEC, tagged Trumpeter Swans in NYS are presumed to be
from the Canadian reintroduction program north of Lake Ontario. Although
most of these programs style themselves as "reintroduction" or "restoration"
programs, and they are referred to in this manner below, the original breeding
distribution of this species remains a contentious subject (Carroll and Swift
2000; Whan 200point, ; Rising 200 1)

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NYSbirds-L List Info:
http://www.NortheastBirding.com/NYSbirdsWELCOME
http://www.NortheastBirding.com/NYSbirdsRULES

ARCHIVES:
1) http://www.mail-archive.com/[email protected]/maillist.html
2) http://birdingonthe.net/mailinglists/NYSB.html
3) http://www.surfbirds.com/birdingmail/Group/NYSBirds-L

Please submit your observations to eBird:
http://ebird.org/content/ebird/

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