Light brown or dark tan colored duck eggs have recently showed up in the poultry pen. I'm just getting one a day so it is from a single duck hen. I suspect it is a muscovy, but all her sister's eggs are white?? The other suspect is an ancona as I only have one of those, but the egg she hatched out from was white. I do have a runner that lays tinted eggs... could they have gotten darker?? My khaki lays green eggs. Any ideas? what breed of duck lays brown eggs?