Glad to help Ann.
I have never seen a tree duck, but I have very good memory of what birds are in my bird guide, or any that I have seen in magazines or any that I see on TV..
I hope you get to see lots of little tree ducklings. Right after they are all hatched, the mother will fly to the ground and coax the ducklings out of the nest, sometimes from a height of 30 feet, they will fall to the ground....thud, they are usually fine.