This may sound stupid, but I have 4 buff orphingtons, 4 RIR's, and Cayuga duck hen. All around 6months. They just started laying this weekend, all over the place, in the yard, and in the coop, as they free range during the day. I have some funky colored eggs, I cannot tell if they are chicken or duck. I thought RIR and BO had a light brown, these are grayish green. Are they duck eggs then? Seems like a lot of eggs for a duck to lay just over this weekend. Any response is appreciated Thanks!