I have only male flight and they all sing.
ANd yes I know the male also meep

But only the males sing.
And the reason for the red beak on both birds is because theyIt is a hen. It is not that unusual for hens to occasionally show bits of male markings.
Not unlike a hen with bits of flanks or a breast bar.
It's a bit unusual for it to be in full color like that,
but I once had a hen with a single orange feather in
her breast with spots like a male flank. Very weird stuff happens every now and again.