Ann, I thought it was so interesting up-thread when you mentioned ducks in a tree! I see ducks fly by occasionally and land in the water but I never realized that any nested in trees. Last April I spotted a beautiful Wood Duck atop a neighbor's chimney and this past November I was out on my back porch and heard a duck quacking, looked over and saw a duck on my neighbors deck railing and another in the elm tree. Eventually the 2nd one ended up on the branch with the other.
Wood Duck:
Muscovy Duck: