How do hummingbird get to the south for the winter?

Hummingbirds hitchhike on the backs of geese flying south for the winter. Because they consume so much energy when they fly they could never make it to South America where they winter without a great deal of help. They nestle just behind the goose's neck right at the front of their wings. They weigh less than 3/4 of an ounce so pose no problem for the goose.