I have many chickens, I know about their egg laying. I have guineas and know they only lay spring/summer. My son just dropped his 2 ducks off at my house. I know nothing. He said he has never seen any eggs so I said they're probably both males. Then I was wondering...he got them last yr. when they were babies, it's just now turning spring...maybe they don't lay all yr. like chickens. Any advice as how to look at them and determine male/female would be highly appreciated. 1 Cayuga, and 1 runner. Thanks.