We have them here from about middle of April to middle of October. When the days get less than 12 hours of light they move on. We have birds stopping by on their way to warmer climates. The baby woodpeckers, ant and bees get into my feeders, I finally stopped filling them. I love to feed them and buy the red humming bird food with vitamins and mineral in it. I don't think anyting could survive very long just drinking sugar water.