I have three mallard hens and two cayuga hens. They recently started laying eggs (well, they've probably been laying for a couple months but they just recently started laying where I can find them). Some of the eggs are elongated and a nice cream color. The others are larger, more round in shape and have a slight green cast to them. I've been assuming the larger eggs are the Cayugas. Am I correct? I have a picture but can't figure out how to add it.