地球の仲間：／７７ ニホンツキノワグマ（上野動物園）／３ ／東京 - 毎日ｊｐ(毎日新聞)
１日の睡眠時間や呼吸数、行動の変化から１２月１８日に冬眠に入ったと確認され、肛門に栓をする硬い「止め糞」が排便された０７年３月１７日に冬眠明けを迎えた。
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肛門に栓をする硬い「止め糞」
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