http://www.cbsnews.com/8301-18563_162-57494003/hummingbirds-facing-drought-and-food-shortage-get-some-human-help/
There has been a lot of discussion about this recently on the VA-Bird list
serve, with speculation about early migration. Here's another possible
explanation - we've certainly never had so many at our feeders
Wendy Ealding
Powhatan County