A record of nesting of White-tailed Sea-Eagle at Nemuro Peninsula, Hokkaido

概要

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The breeding of the White-tailed Sea-Eagle, Haliaeëtus albicilla Linné, has been reported from Abashiri by the author (1955). Further survey was made last spring with the help of the members of local Forestry Bureau and two nests were found (Fig.1).Nest I (Fig.2, 3) was found on the top of the Silver-fir (Picea jezoensis) 22 meters from the ground at Onneto in Ochiishi. This nest was newly built and its size was 1062cm×45cm, incubation bed being 652 cm. There ere two young in the nest which were fed with fishes and crows.Nest 2 (Fig. 4) was on the branch of the Birch-tree (Betula Ermani Cham. var. communis Koidz.) at about 14 meters from the ground at Nohkamaep in Nemuro-Makinouchi. The nest was used for two successive years from 1954. The size was 1202cm×75cm, incubation bed 852cm. There was one young in the nest. The bones of crows and a salmon (Oncorhynchus masou) were found around it.The breeding of the White-tailed Sea-Eagle may be found more extensively in the area including Abashiri, Nemuro Peninsula and probably Shiretoko Peninsula in eastern Hokkaido.
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