What visual cue is slightly more likely to be exhibited by the male White-crowned Sparrow during the breeding season?

Answer

Slightly brighter plumage

The male has the possibility of exhibiting slightly brighter plumage during the breeding season, though this difference is minor, subjective, and difficult to verify reliably in field observation.

What visual cue is slightly more likely to be exhibited by the male White-crowned Sparrow during the breeding season?
birdappearancefemaleWhite-Crowned Sparrowmale