You were correct. After about six months she stopped nesting and they have been together ever since.
However, for the last two days it had been nesting again.
They are over 12 years old. At least, if one died the other would not be concerned like happened once before when a dog killed its mate and a vet had to treat it for depression.
I have two elderly female muscovy ducks. They used to hang out together in their enclosure and would go to the swimming pool in the evenings when I let them out.
All this has changed. The one duck sits permanently on a nest, for about six months now, and only leaves it to feed while the other...