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Journal of Ethology

, Volume 27, Issue 1, pp 83–89 | Cite as

Improved walnut-feeding skills with experience in wood mice, Apodemus speciosus

  • Reina Takechi
  • Noriko Tamura
  • Fumio Hayashi
Article

Abstract

The wood mouse Apodemus speciosus can consume the hard-walled walnut species Juglans ailanthifolia. The mice gnaw holes on two sides of the shell and then pick the meat from the holes. However, not all mice are able to eat these walnuts, because the shells are extremely hard and the process is labour-intensive. To consume all of the meat it is more efficient to eat from holes on the raphe than to attempt to eat from other parts of the shell. We examined the effect of experience on the walnut-feeding skills of mice in the field. Feeding behaviours were compared among mice from habitats with and without walnut trees. Mice from habitats with walnut trees tended to consume nuts more efficiently than mice from habitats without walnut trees. We also observed the feeding behaviour of mice in an experimental area into which walnuts were artificially placed over a period of one year. This manipulation increased the proportion of mice that were able to eat nuts frequently and efficiently. Therefore, the walnut-feeding skills of mice improved with experience. Because individual mice acquired efficient feeding during the 14-day period of walnut conditioning, trial-and-error learning may be an important mechanism contributing to this behaviour.

Keywords

Effects of food supply Feeding manner Food value Learning Seed predator Training 

Notes

Acknowledgments

The authors thank Y. Ino, T. Suzuki, and T. Kusano for discussions of various aspects of this study, and the staff of the Tama Forest Science Garden for their valuable support in the field investigations. The capture of mice was permitted by the Tokyo Metropolitan and Shizuoka Prefectural Governments. All procedures were approved by the Tokyo Metropolitan University Animal Ethics Committee.

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Copyright information

© Japan Ethological Society and Springer 2008

Authors and Affiliations

  1. 1.Department of BiologyTokyo Metropolitan UniversityTokyoJapan
  2. 2.Tama Forest Science GardenForestry and Forest Product Research InstituteTokyoJapan

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