Abstract
According to the Checklist of Japanese Birds (fifth and revised edition) published in 1974 Accipiter nisus is a common summer visitor in Hokkaido. However, A. nisus has been occasionally observed in winter in different areas of Hokkaido. As part of avifaunal studies at Tomakomai (Tomakomai Experiment Forest of the Hokkaido University), Bibai, Sapporo and Ebetsu (Nopporo Forest Park), data were obtained on occurrences of A. nisus from November to March of next year. Study areas were covered with snow from early December to mid-March. A total of 50 birds were recorded. In most cases they were seen flying above residental of wooded areas. On rare occasions birds were seen attempting to catch Parus major or Turdus naumanni. Based on information derived from the present study and reports published previously, A. nisus observed in winter is not late remaining or early arrived birds, but wintering ones.
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