Record for Juvenile Male Japanese Robin (<i>Erithacus akahige tanensis</i>) from the Base of Mt. Oyama, Kanagawa Prefecture

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  • 神奈川県大山山麓におけるタネコマドリ<i>Erithacus akahige tanensis</i>の記録

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A juvenile male Japanese robin (Erithacus akahige tanensis) was captured and banded on November 6, 2006. The bird was caught in a mist net along a small stream in a narrow valley, at the base of Mt. Oyama in Kanagawa Prefecture, a little bit to the west of Tokyo, and was released after being measured and banded. The identification as subspecies tenansi rather than subspecies akahige was based on a lighter-colored bill, and lack of a dark grey band on the chest. In addition, the bird was identified as a juvenile male by sharp tips on the tail feathers, and lack of a clear boundary between the orange and gray colors on the chest. This was the first record in Kanagawa Prefecture for subspecies tanensi. Normally, this subspecies is thought to reside primarily on offshore islands such as Kozu, Miyake and Hachijo Islands in the Izu Island group; while subspecies akahige inhabits the mainland. Subspecies tenensi, however, frequents dwarf bamboo thickets and other dense vegetation, and rarely ventures out into open areas. This makes observation, especially during the autumn migration period when the birds do not sing. This record indicates the possibility that some subspecies tanensi may be mixed in with the spring and late summer migrations of subspecies akahige.

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