Breeds in Alaska and western Canada, wintering along coastal southern Alaska, British Columbia and northern USA; also several resident populations in several states of north-western USA, mostly from reintroductions.
Trumpeter Swan (Cygnus buccinator) [XC713788]
by Valerie Heemstra from Killdeer Plains Wildlife Management Area, Wyandot County, Ohio, United States (call)
Trumpeter Swan (Cygnus buccinator) [XC247988]
by Carita Bergman from Douro-Dummer (near Harcourt), Peterborough County, Ontario, Canada (call)
Subspecies
Sometimes considered a subspecies of Whooper Swan (Cygnus cygnus), with which it forms a superspecies.