Speaking of bill and leg color, how can you tell which of your WH ducks are laying or not? Is there a visible change I their bill or leg coloration like with other breeds?
Might try this site. They have a good explanation of how to check if during k it laying or not. Don't think you can tell buy bill, eyes or leg color like you can with chickens. My WH have a 3 finger spread and 1 lays every day, another will lay every other day and one will lay once a week. But all three have the same spread. Hope this helps.