But I know it's spring, because the snowbirds are BACK!!!! They are really snow buntings, but everyone here calls them snowbirds. They are the first birds back (except for the ravens that spend the winter) and they are the true sign of spring. The males sing, loudly, from high perches, and I often hear them a couple days before I see one. I'd been hearing them for a few days, and then saw one driving home from work a couple of days ago.