At least I assume it is. I have ducks and chickens too. But this egg was left by the pond, is rather large, very rough on the outside, covered in a very thick bloom, lots of blood on the outside and contained only one very huge yolk. It weighed 114 grams. My biggest duck egg was a double yolker weighing in at 102 grams- from a Pekin. This egg did not look like a duck egg...but it smelled like one. (waterfowl eggs smell like wet dog lol) So my goosey girl laid an egg in January? Is that normal? Should I do anything for her now? She lives with the ducks and it offered the same food- Mazuri mixed with oats, free choice oyster shell and turned out at 10am to free range daily. I have not personally seen my gander and goose mate yet. They honestly act like they are beyond such behavior- they are so very proper lol. Thanks!