Abstract
A wintering Trumpeter Swan Cygnus baccinater was observed in flocks of the Whooper Swan Cygnus cygnus in the Kitakami River, Kitakami City, lwte Prefecture. The bird stayed for 26 days from March 29 to April 24, 1992. A single Trumpeter Swan was sighted with a flock of 17 Whooper Swans at the Kitakami River, Morioka City, Iwate Prefecture on December 15, 1991, while a resting Trumpeter Swan was reported at Izunuma Pond, Miyagi Prefecture on December 20, 1991 with four Whooper Swans including three young. The Trumpeter Swan at Kitakami City left for the north with 27 Whooper Swans in the early morning of April 24, 1992. As a result of comparison with photos and video tapes taken, the Trumpeter sighted at three different localities was identified as the same individual.
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