We've had an interesting hummingbird migration change in the last 4 days ~ for more than a week prior to Labor Day we had almost entirely Black-chinned Hummingbirds dominating our 3 feeders, as many as 10 - 12 birds. Then from September 9 - 10, the activity dropped to just a couple Anna's males, who sat and sang and sparred a bit. But then today, a few late Rufous migrants roared in and we have 6-8 birds zooming around madly again. Fall in the Sonoran Desert!