When I began birding in the 1970’s, Louisiana often experienced what we called “invasion” winters, where some combination of cold weather, food distribution and luck pushed large numbers of northern species into Louisiana. In fact, it was just such an invasion that really pushed me into birding, when a friend of my mother’s hosted dozens of Evening Grosbeaks, Purple Finches, Pine Siskins, and other birds at her feeders in the winter of 1977-78.
When I returned to birding in the early 21st century, after almost 20 years of not paying attention, things had changed. Winters were far more likely to feature summer birds and fall migrants “staying over” into the winter months, and the winter hummingbird phenomenon had replaced nothern invasions as a birding hot topic. On our Christmas Count this year, for instance, we had this perky little fellow, an Ash-throated Flycatcher, hanging out in the batture on the Mississippi River near LSU:

This photograph of the Ash-throated Flycatcher was taken by Dr. Carol Foil, who discovered the bird during the Christmas Bird Count in Baton Rouge.
Ash-throated Flycatchers, like this one, are rare but semi-regular winter visitors from the western United States, like many of our hummingbirds.
So I was pleased during the Christmas Bird Count to hear that some of the counters had found Purple Finches on their count tallies. This is a bird we haven’t had regularly in winter in Baton Rouge for years. I was fairly certain that the folks who saw the birds correctly identified them, even though they can be confused with House Finches (a recent introduction to eastern avifauna). Two days later, I had fairly good backup, as several Purple Finches made it to my yard as well:

At the same time, the western winter invasion continues, as I also saw a Buff-bellied Hummingbird in my yard – briefly, but long enough for it to count. These birds of the lower Rio Grande Valley area, for some reason, occasionally migrate north in winter and find themselves along the Gulf Coast. This year, we’ve seen a couple of dozen of them already, and more are being reported every few days. I’ll have to get pictures if I see another one in my yard – the camera is now ready by the window.