
TY  - JOUR
A1  - Smith, GC 
A1  - Carlile, N 
A1  - Tully, S 
T1  - Sexing and aging silver gulls, Larus novaehollandiae
JF  - Wildlife Research
JO  - Wildl. Res.
Y1  - 1992
VL  - 19
IS  - 3
SP  - 341
EP  - 345
KW  - 
UR  - https://doi.org/10.1071/WR9920341 
N2  - Measurements of bill size differed between gulls from three widely separated Australian regions, suggesting that there are a number of different subpopulations. When assigning an individual to a sex, a geographical locality factor should be incorporated into the discriminant model. Bill colour may be a useful tool for ageing gulls and detailed colour categories have been identified which could be used to define relative ages. Free-flying gulls are here ascribed to one of seven categories. Colour categories may not be universal; therefore, the population should be considered region by region. 
ER  -

