I have 4 ducks. Graham is 1/2 runner & 1/2 khaki campbell. Ritz is 1/2 runner & 1/2 pekin. Both of these girls were hatched last summer. Sally & Slim are a matched pair of runners from Holderread's, shipped here about 3 months ago, fully mature. I've been getting 2 off-white large eggs a day for a couple of months now. Today, I got a slightly smaller (but still large by chicken standards), beautiful aqua-green egg-- laid in the duck pool! (kiddie pool)--first time that's happened! Who do who think laid it? any opinions would be greatly appreciated! Regardless, I will be putting these eggs to hatch as soon as my good hen Myrtle goes broody this spring! Evidently, the ducks only lay at night---is this normal? anybody know how to tell who laid what egg? Please help!