No clue; but the Holderred Waterfowl Farm and Preservation Center has lots of pictures that might help. They have just about every breed of waterfowl that is in the US.
You have a Khaki Campbell drake (the brown one) and a couple of Gold Welsh Harlequin hens (white with lighter brown markings and shaded heads) in addition to the Pekin(s) (solid white).
Welsh Harlequins are excellent layers and start popping out eggs around 6 months old. Mine usually take December and January off, but lay almost an egg a day other than that. WH are also good broodies...usually best when they are about 2 or older. One of my WH hatched a clutch this spring but it was her first time and she was barely a year old. She didn't really get the hang of rotating the eggs so it was a weird, staggered hatch and we only got 4 ducklings out of it. I am going to let her try again next spring and see if she does better.
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I have never had a duck to lay an egg or anything or set so i really dont know what they do...i have them a "nest box" but ive read that they dont need it and may not even use it... so if anyone has any info on anything that would be great