Table 1 Factors associated with flight initiation distances in black swans. DRD4 genotype (i.e. common or rare genotype), heterozygosity at eight microsatellite loci, starting distance and distance from water were included as independent variables in generalised linear mixed models, incorporating swan identity as a random factor (random effect variance = 0.092 ± 0.033, Z = 2.757, P = 0.006)

From: Variation at the DRD4 locus is associated with wariness and local site selection in urban black swans