Regarding the adult plumage of the White-crowned Sparrow, how do males and females differ visually in the field?

Answer

For all practical field purposes, they look the same (sexually monomorphic)

The core plumage defining the species, including the namesake crown pattern, is shared equally between the sexes, making visual separation in the field nearly impossible.

Regarding the adult plumage of the White-crowned Sparrow, how do males and females differ visually in the field?
birdappearancefemaleWhite-Crowned Sparrowmale