All of my ducks were killed by a neighbors dog. We had 7 eggs at the time we could incubate, only 3 survived to make some beautiful fawn and white Indian Runners just like the originals. We bought some Chocolate Indian Runners that were really rescue ducks. When they grew to maturity it turned out that the only drake we had was one of the fawn and whites. For some reason he would only breed with the Chocolate ducks. One of our female fawn and white ducks was laying eggs and doing just fine. She was constantly presenting herself to the drake, bobbing her head and, from our perspective, it was like, what's a girl gotta do here. The drake wouldn't participate in the affection. Then she started mounting our other fawn and white female as though she was a drake whenever they were in the pond. If you're aware of duck love, they seemed to finish the mounting like a drake and a duck. She/He quit laying any eggs for several weeks. For the last couple of days she/he has been real weak acting and is laying "balloon" eggs, or eggs without a shell. Has anybody experienced this type of situation?