But it is not because of feeders. Feeders probably extend, briefly, the life of a few of them. Look at it logically. If feeders were so powerful a magnet that they could undo uncounted years of evolution, there would be tens of thousands of ruby-throated hummingbirds trying to winter in the eastern half of the continent because there are that many feeders. So keep those feeders up if you enjoy watching the birds.
Hummingbirds migrate by riding on the backs of geese.
This is one of my favorites, and I am amazed by its durability in the face of all common sense. That's because there is none. Forget for the moment the improbability of this cooperation. Look at the migration of hummingbirds and geese. Except for a few birds in a small area of the country, there is virtually no overlap in the migration pattern and timing of geese and hummingbirds.