A. Gagliardo et al., The ontogeny of the homing pigeon navigational map: evidence for a sensitive learning period, P ROY SOC B, 268(1463), 2001, pp. 197-202
Citations number
41
Categorie Soggetti
Experimental Biology
Journal title
PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES B-BIOLOGICAL SCIENCES
Homing pigeons can learn a navigational map by relying on the heterogeneous
distribution of atmospheric odours in the environment. To test whether the
re might be a sensitive period for learning an olfactory-based navigational
map, we maintained a group of young pigeons in an aviary screened from the
winds until the age of three to four months post-fledging. Subsequently, t
he screens were removed and the pigeons were exposed to the winds and the e
nvironmental odours they carry for three months. One control group of pigeo
ns was held in a similar aviary but exposed to the winds immediately upon f
ledging, while another control group of pigeons was allowed free-flight. Wh
en the pigeons from the three groups were released from two distant release
sites at about six months of age post-fledging, the two control groups wer
e found to be equally good at orientating and returning home, while the exp
erimental pigeons held in the shielded aviary for the first three months po
st-fledging were unable to orientate homeward and they were generally unsuc
cessful in returning home. This result supports the hypothesis that environ
mental experience during the first three months post-fledging is critical f
or some aspect of navigational map learning and that navigational map learn
ing displays sensitive period-like properties.