Nut-dropping behavior of Carrion Crows in Hakodate City, Hokkaido

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  • ARA Kanami
    Department of International and Regional Studies, Hakodate Campus, Hokkaido University of Education
  • MIKAMI Katsura
    Japan Bird Research Association
  • MIKAMI Osamu K.
    Department of International and Regional Studies, Hakodate Campus, Hokkaido University of Education

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Other Title
  • ハシボソガラス<i>Corvus corone</i>の投下法によるクルミ割り行動
  • ハシボソガラスCorvus coroneの投下法によるクルミ割り行動
  • ハシボソガラス Corvus corone ノ トウカホウ ニ ヨル クルミ ワリ コウドウ

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Abstract

We observed the nut-dropping behavior of Carrion Crow Corvus corone from October to December 2016 in Hakodate, Hokkaido, Japan. Carrion Crows dropped two species of walnuts, mostly Juglans mandshurica, but occasionally also J. regia var. orientis. Nut-cracking behavior, using automobiles, was often observed at intersections rather than on straight roads, but nut-dropping behavior was observed equally at both. The average height from which crows dropped nuts was related to their success rate: higher drops led to more nuts being broken.

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