Female bluethroats prefer males with symmetric colour bands

Fluctuating asymmetry in male ornaments may be related to male quality and therefore may be used by females as a guide in mate choice. Experiments on different species have shown female preferences for symmetry, but few previous studies have addressed preferences for symmetry in coloration. Using the bluethroat, Luscinia s. svecicaa passerine with a conspicuous blue and chestnut throat patch, as a model species, we devised an experiment in which the females could choose between males with either symmetric or asymmetric coloured leg bands. The females associated more with symmetric than asymmetric males, indicating a preference for symmetry.