Sexing Mallards by bill color

[Kaitie09]

We have 5 week old mallards and we have no clue their sex. They both still peep, but it is becoming a little raspy, and they both are normally talkative. The only real difference between them right now is their bill color. One has a brown strip, but with yellow sides. The other one has a mostly brown bill, with a little bit of a cream coloring. Is there a way we can guestimate their sex by that?

 

[MissusDee]

Do they have speculum color yet? Usually the females are more purplish and males are bluer. Yellow is usually male though. May take another week or two to be really sure.

 

[Kaitie09]

Thank you. They each have just a sliver of the white in their feathers right now