Prefecture i皿 autumn a ロd 玉 且 winter during the years from 3963 to l964 . 2. The crows belQnged to the following three roosting 且ock areas , Nojiri , ' Sanseiji and Nukazukayama , each bei且 g in且uenced by the lay of the land. 3. It was found that the flight line was in the IQwest part of the area like ・ avalley or above the river , making use of the natural features . 4. The roosting place of the crows 重 皿 the Zenkoji basin was . observed to shQw seasonal var 三 ation . No breedi 旦 g bird ' s

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... st was observOd in the breeding seaso 丑 , and both autumnal and winter roosts were observed i旦 the non breedi 且 g seasQ 韮 . 5. In the heavy s 且 ow district at the 且 orth of the Zenkoji basin , when the snow accu − mulated heavily and conti 皿ued for a long time the winter roost was mQved from Lake Nojiri to Inoue in the suburbs of Suzaka City. 6 , The seasonal variation of the roosting place of crows is to be published at another occas10 且 . L は じ め に