著者名,論文名,雑誌名,ISSN,出版者名,出版日付,巻,号,ページ,URL,URL(DOI) KRUUK H.,Seazonal and spatial differences in food selection by otters (Lutra lutra) in Shetland,Journal of Zoology (London),,,1990,221,,621-637,https://cir.nii.ac.jp/crid/1570291224334450560,