So, I have 4 muscovy hens that are 4-5 months old..... they sleep in the coop with the chickens because it's warm. I found a hidden nest in there today, that everyone seems to use... I've now found about 5 or 6 of these slightly greenish eggs, a bit larger than a chicken egg.. and the shell doesnt look solid.. it looks like an egg shell thats been soaked in water for a while almost slightly translucent in spots.. Could these be from a duck? they're VERY dirty eggs, and i've found two outside - one by the pond, and another by some food. I have a white leghorn egg with two of the unknown eggs. One I've washed a bit to show the colouring, the other I left as is. I rarely wash my eggs, as they are usually clean, but these mystery ones are gross!