Photo by river resident, Denise Kent, captured the frenzy feeding of hummingbirds migrating through on September 11, 2011.The 911 memorial flag on the left has an eagle as part of the artwork that looks like one of the hummingbirds.
Hummingbirds migrate south at the time of greatest food abundance. When the bird is fat enough, it migrates. It's not necessary to take down feeders to force hummingbirds to leave, and in the fall all the birds at your feeder are already migrating anyway. If you remove your feeder, birds will just feed elsewhere, but may not bother to return to your yard the next year.