TY - JOUR
T1 - Sex and age determination of short-eared owl nestlings
AU - Arroyo, Beatriz E.
AU - Cornulier, Thomas
AU - Bretagnolle, Vincent
PY - 2000/2/1
Y1 - 2000/2/1
N2 - We studied plumage patterns of known-sex nestling and juvenile Short-eared Owls (Asio flammeus) to develop a sexing technique for nestlings in the field. Markings on the secondaries varied according to sex, and differences were apparent from about 10–15 days of age. We also provide aging formulas based on mass for nestlings up to 15 days of age and on wing length for nestlings older than that age. Finally, we evaluate growth parameters according to sex. The asymptotes of body mass, wing length, and tarsus length growth curves were higher in females than males. The inflexion point was attained earlier by males than by females.
AB - We studied plumage patterns of known-sex nestling and juvenile Short-eared Owls (Asio flammeus) to develop a sexing technique for nestlings in the field. Markings on the secondaries varied according to sex, and differences were apparent from about 10–15 days of age. We also provide aging formulas based on mass for nestlings up to 15 days of age and on wing length for nestlings older than that age. Finally, we evaluate growth parameters according to sex. The asymptotes of body mass, wing length, and tarsus length growth curves were higher in females than males. The inflexion point was attained earlier by males than by females.
UR - https://digitalcommons.usf.edu/cgi/viewcontent.cgi?article=13896&context=condor
U2 - 10.1093/condor/102.1.216
DO - 10.1093/condor/102.1.216
M3 - Article
SN - 0010-5422
VL - 102
SP - 216
EP - 219
JO - Condor
JF - Condor
IS - 1
ER -