I finally gave in to my sumatra broody hen tonight and left her on 7 eggs. Then I went to tuck in the 7 month old guineas and found a tiny egg in their coop. So..without a second thought, I brought it to the broody. Now I'm wondering if the incubation time is the same?? and hunidity requirements?? oh well..it wouldn't have done much on the floor of the guinea coop anyway...