In the mid 1970s, the Eurasian Collared Dove (Streptopelia decaocto) was only present in the western hemisphere as a pet. In Bermuda, the burglary of a bird shop led to the release of several doves, and for some reason the owner let the other 50 go. In the 1980s, the first Eurasian Collared Doves arrived in Florida, and now have spread across the continent, except for the Great Lakes and New England. They were in California by 2001.
I've only been at this for about a year, so I thought the doves in my neighborhood were all of the mourning kind, but I've come to realize that most of them are the Eurasian species. It's not clear if they have displaced other birds the way the European Starlings have, though. The doves are mostly taking advantage of food sources related to urban and suburban development, including feeders.
In any case the doves, if not exactly tame, are tolerant of walkers with cameras and are usually easy to photograph. I caught the first image this morning while walking in the pasture near my house. The second picture was taken in December around the same field. The birds are apparently permanent fixtures around here, despite their fairly recent arrival. And they are pretty to look at.