| Summary: | The presence of a breeding population of Trumpeter Swans (Cygnus buccinator) in the Yukon is established from previous summer records of swans and by data from extensive aerial surveys. The population is estimated to number about 50 pairs, with at least 32 pairs found near Toobally Lakes in southeast Yukon Territory. Habitat, nesting, population, and migration data are presented for the Toobally Lakes population. The habitat is characterized by rolling hills interspersed with water bodies from 5 ha to 250 ha in the area, frequently influenced by beaver. Nesting and cygnet development appeared to be later than those reported for Alaska or Alberta. Cygnet production was 19 young by August 1980 and 26 young by July 1981. Band returns indicate that part of the Yukon population winters in Montana. Recommendations for habitat protection are made.Key words: Trumpeter Swans, Cygnus buccinator, Yukon, breeding, distribution, migration, habitat Mots clés: Cygne trompette, Cygnus buccinator, Yukon, nidification, distribution, migration, habitat
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