I'm not sure if my duck or one of my chickens laid this egg. The only chicken i have that could possibly lay an egg is a buff cochin that i got a short time ago. But this egg is slightly green, and much smaller than my other duck's eggs. If it's a duck egg, it is the first egg from my female duck that I'm not sure of her breed. I did find it where the duck likes to hang out in the coop though. It just looks so different I'm not sure.