Behavioral Ecology and Sociobiology

, Volume 69, Issue 1, pp 159–167 | Cite as

Avian olfactory displays: a hypothesis for the function of bill-wiping in a social context

  • Danielle J. Whittaker
  • Dustin G. Reichard
  • Marine Drouilly
  • Kathryn Battle
  • Charles Ziegenfus
Original Paper

Abstract

Bill-wiping, or the scraping by a bird of its bill along a substrate, has been observed in social contexts and cited as an irrelevant displacement activity. However, several behaviors once categorized as displacement behaviors have since been shown to serve adaptive functions. Here, we hypothesize that bill-wiping may function in social interactions by releasing odors from the waxy residue of preen oil on the bill. We assessed behavioral context associated with bill-wiping by comparing the frequency of bill-wiping by free-living male songbirds when presented with a caged male or female conspecific paired with playback; males bill-wiped significantly more often in response in a courtship context and in a mate-guarding context than in a territorial context. Bill-wiping frequency correlated with courtship behaviors, such as tail spreading and singing short-range songs, but not with aggressive behaviors. We also noted attributes of individuals that engaged in bill-wiping during courtship and found that younger, smaller males performed this behavior more frequently than older, larger males. Finally, we conducted a captive Y-maze experiment to test whether dried preen oil residue would be more detectable if it were manipulated (scratched to potentially release odor) or unmanipulated. Preliminary evidence suggests that males could be more responsive to manipulated preen oil, though stronger tests are needed. Taken together, our results suggest a functional hypothesis: bill-wiping during courtship may be an olfactory display that releases odor that may be detected by potential mates and rivals. We conclude by suggesting ways in which future work can test the olfactory display hypothesis.

Keywords

Chemical communication Songbirds Preen oil Courtship 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Danielle J. Whittaker
    • 1
    • 2
  • Dustin G. Reichard
    • 3
  • Marine Drouilly
    • 4
  • Kathryn Battle
    • 5
  • Charles Ziegenfus
    • 6
  1. 1.BEACON Center for the Study of Evolution in ActionMichigan State UniversityEast LansingUSA
  2. 2.Department of BiologyIndiana UniversityBloomingtonUSA
  3. 3.Department of Evolution and EcologyUniversity of CaliforniaDavisUSA
  4. 4.Department of Biological SciencesUniversity of Cape TownRondeboschSouth Africa
  5. 5.College of Natural Resources and EnvironmentVirginia Polytechnic Institute and State UniversityBlacksburgUSA
  6. 6.Department of BiologyJames Madison UniversityHarrisonburgUSA

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