title: Olfactory lateralization in homing pigeons: a GPS study on birds released with unilateral olfactory inputs.
abstract: A large body of evidence has shown that pigeons rely on an olfactory-based navigational map when homing from unfamiliar locations. Previous studies on pigeons released with one nostril occluded highlighted an asymmetry in favour of the right nostril, particularly concerning the initial orientation performance of naïve birds. Nevertheless, all pigeons experiencing only unilateral olfactory input showed impaired homing, regardless of the side of the occluded nostril. So far this phenomenon has been documented only by observing the birds' vanishing bearings. In the present work we recorded the flight tracks of pigeons with previous homing experience equipped with a GPS data logger and released from an unfamiliar location with the right or the left nostril occluded. The analysis of the tracks revealed that the flight path of the birds with the right nostril occluded was more tortuous than that of unmanipulated controls. Moreover, the pigeons smelling with the left nostril interrupted their journey significantly more frequently and displayed more exploratory activity than the control birds, e.g. during flights around a stopover site. These data suggest a more important involvement of the right olfactory system in processing the olfactory information needed for the operation of the navigational map.
authors.affiliation: Department of Biology, University of Pisa, Pisa, Italy. agagliardo@biologia.unipi.it
authors.forename: Anna
authors.initials: A
authors.lastname: Gagliardo
authors.forename: Caterina
authors.initials: C
authors.lastname: Filannino
authors.forename: Paolo
authors.initials: P
authors.lastname: Ioalè
authors.forename: Tommaso
authors.initials: T
authors.lastname: Pecchia
authors.forename: Martin
authors.initials: M
authors.lastname: Wikelski
authors.forename: Giorgio
authors.initials: G
authors.lastname: Vallortigara
mesh_terms: D000818:Animals; D010856:Columbidae / Q000502:physiology*; D007839:Functional Laterality / Q000502:physiology*; D040362:Geographic Information Systems; D006702:Homing Behavior / Q000502:physiology*; D007558:Italy; D009949:Orientation / Q000502:physiology*; D012903:Smell / Q000502:physiology*; D018709:Statistics, Nonparametric