okay this may sound odd, but can ducks have multiple genders?? i've got one duck who i originally thought would be a girl due to size, but as the rest of its siblings learned to quack it was very quiet, so i figured it'd be a drake. when he finally did learn to quack((much later than the rest of them for some reason)) it sounded like a drake. but every now and then i would question it again because he would quack and it would sound like a mix between the raspy male quack and loud female quack. when his green feathers started to grow in i thought i must just be hearing him wrong and he is definitely a drake. however now i've noticed his head isn't completely green like his brother. it's got brown markings across his face. i'm just confused because his siblings seem like perfect examples of the gendered feather patterns and voices but he just seems like both. is it possible or is he just an oddball drake??