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.
