Our little hummingbird friends are still visiting, but I know they will be flying on soon. I had always heard to take down your feeders, as leaving them up would encourage them to stay. Hummingbirds migrate in response to the decreasing length of daylight. The Oklahoma information I found was to keep up your feeders for a couple of weeks after you have seen the last hummer, in case any stragglers come through. They'll certainly appreciate the food when natural resources are low.
9 hours ago