My Emden goose recently hatched four goslings. Three are yellow with tinges of gray, while one is yellow with slightly darker markings. I initially believed the father was my young Emden gander, as he was always protecting her nest. But now I'm starting to wonder because of the markings of the one chick. I do own three aged, mixed-breed ganders who have appointed themselves guardians of the goslings. My question is, are eggs in a clutch all typically fertilized by the same gander?