> How can I tell what breed my 6 week old baby ducks are?

How can I tell what breed my 6 week old baby ducks are?

Posted at: 2014-11-15 
Sexing can be the easiest when they are about a day old. White one can be a pekin duck or a snowy call duck. The black one is a black east indie duck and i'm 100% sure!

Like once they grow all their feathers. A male has a curl in his tail and a female just has a flat tail. "QUACK" goes the female and "ACK" goes the male :) They are so cute!

SOOOOOOOOOOOOOOOOO cute THE WHITE MAY BE A PEKIN THE BLACK COULD BE A CROSS WITH WHAT ?

The duck on the left is all black and is starting to get some green tinted fethers on its head and when I first got it it had a little yellow patch on its chest and the duck on the left was yellow when I first got it and now it is turning white with orange feet and bill..and at what age can I tell the sex of these ducks?