
%0 Journal Article
%A Smith, GC 
%A Carlile, N 
%A Tully, S 
%T Sexing and aging silver gulls, Larus novaehollandiae
%J Wildlife Research
%D 1992/05/01
%V 19
%N 3
%P 341-345
%K 
%R https://doi.org/10.1071/WR9920341
%U https://www.publish.csiro.au/paper/WR9920341 
%X 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. 
