Abstract
Chicks of two races of California Gull (Larus californicus), which differ by 27Oh in adult body mass, grew to fledging at similar rates when maintained in a common envi- ronment and provided with food ad libitum. There were sexual differences in growth rates; males, which were larger, developed more slowly than females. Racial differences in size were maintained, but appeared to be smaller in captive adults and juveniles than in wild birds, indicating that both genetic and environmental components influence body size; racial differences in plumage were maintained and seemed to be under genetic control. Growth patterns and asymptotic size of captives differed from those reported for wild birds, reflecting both captivity effects and procedural bias in determining asymptotes in field studies.
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