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Sex ratio is an important parameter to consider inecological and conservation seabirds studies(Weimerskirch & Jouventin 1987). Visually assessingwith certainty the sex of live seabirds, however, maybe an impossible task when no obvious differences inplumage or body size exist between the two sexes.Several previous studies of Laridae species haveshown that males are signicantly larger than females(external measurements) and discriminant functionsusing measurements sex Laridae with great reliability(Shugart 1977; Ryder 1978; Fox et al. 1981; Schnellet al. 1985; Coulson et al. 1983; Evans et al. 1993;Bosch 1996; Rodriguez et al. 1996; Palomares et al.1997).The Black-tailed Gull

Sexual differences in the external measurements of Black-tailed Gulls breeding on Rishiri Island, Japan