Its the standard grey dove, I think we know it as the mourning dove. The page you found says that in both cases the parents hare the nest sitting duties. The female sits from late afternoon through the night until about 10AM and then daddy takes a turn. Also it says that there are two eggs, which also holds true in this case. The only difference is that the incubation is 13 days instead of 16 to 18. Thanks, Sorcha!