Last year I had a pair of doves who had several broods using the same nest. I would see the mom and dad each sit on the nest, rarely left unattended. However, I now only see one bird and the nest is left unattended for an hour or so. I wonder if something happened to one of the parents. Last week, I saw a Hawk run into my window and when I looked outside there was a broken egg. One dove has returned and does sit on the nest. As I said, last year as one flew into the nest the other would leave, but that is not what I am seeing. What do you think the reason is I only see one parent? Will the egg hatch and the baby survive?