Cognitive ethology focuses on the study of animals under natural conditions to reveal ecologically adapted modes of learning. But biologists can more easily study what an animal learns than how it learns. For example, honeybees take repeated ‘orientation’ flights before becoming foragers at about three weeks of age1. These flights are a prerequisite for successful homing.2 Little is known2,3 about these flights because orienting bees rapidly fly out of the range of human observation. Using harmonic radar, we show for the first time a striking ontogeny to honeybee orientation flights. With increased experience, bees hold trip duration constant but fly faster, so later trips cover a larger area than earlier trips. In addition, each flight is typically restricted to a narrow sector around the hive. Orientation flights provide honeybees with repeated opportunities to view the hive and landscape features from different viewpoints, suggesting that bees learn the local landscape in a progressive fashion. We also show that these changes in orientation flight are related to the number of previous flights taken instead of chronological age, suggesting a learning process adapted to changes in weather conditions, flower availability and the needs of bee colonies.
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We thank J. Drew, T. Hallam, J.C. Kuehn, C. Mata and J. Strand for field assistance in Illinois, N. Carreck for beekeeping assistance at Rothamsted, S. Aref for help with data analysis, and F.C. Dyer and the members of the Fahrbach and Robinson laboratories for reviewing this manuscript. This work was supported by the National Science Foundation, The Research Board of the University of Illinois at Urbana-Champaign, the Biotechnology and Biological Sciences Research Council of the United Kingdom, the British Beekeepers' Association, the European Community Regional Tsetse and Trypanosomiasis Control Programme, the Leverhulme Trust and the United Kingdom Department for International Development Flexibility Fund. E.A.C. was supported by a National Research Service Award from the NIH.
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Capaldi, E., Smith, A., Osborne, J. et al. Ontogeny of orientation flight in the honeybee revealed by harmonic radar . Nature 403, 537–540 (2000) doi:10.1038/35000564
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