山階鳥類研究所研究報告
Online ISSN : 1883-3659
Print ISSN : 0044-0183
ISSN-L : 0044-0183
八丈島産コブハクチョウ
山階 芳麿
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1952 年 1 巻 1 号 p. 32

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Mr. G. Okuyama in November, 1933 procured a swan on Hachijo Island, one of the Seven Islands of Izu and, it was identified by Mr. Tokutaro Momiyama (1939) as Cygnus cygnus (specimen no. 340033).
I have recently exmined this specimen and found out that it is Cygnus olor, not C. cygnus as formerly considered it to be. This fact constitutes the first record of the Mute Swan found in the Japanese Islands.

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