There is a bit of folklore about hummingbirds that has been around for quite some time now regarding the belief that they hitch a ride on the back of geese during their migration to South America. It is believed that this myth if not started by John J. Audubon himself, was certainly strengthened by him. They story goes that one day when he shot a goose out of the sky, as he ate the meat of many of the birds depicted in his paintings, that when he went to retrieve the gooses body and turned it over, out flew a hummingbird.
Now if this was the case, it is more likely the goose just hit the hummingbird on the way down, trapping it beneath its body for there is no scientific evidence that would back up this theory of hummingbirds riding upon the back of geese in migration. When some thought is put into it, there is just too many variables and differences between the species of hummingbirds and geese that just would not add up to even coming close to make this bit of folklore true.
Geese fly in large flocks at high elevations when in migration, where hummingbirds fly by themselves just above the waves by water or just above tree lines on land. With their rapid wing beats, a hummingbird is more than capable of flying long distances at a relatively quick pace and has no problems propelling themselves in migration on their own energy and ability. Also, geese and hummingbirds migrate to totally different regions that do not even come close to each others migratory territories. Geese only head south, not tropical south, still residing within the Southern United States areas where hummingbirds continue on to South America typically between southern Mexico and Panama.
You also have the difference in time frames on which each species tends to start migrating. Geese start to head south when the ground starts to freeze, about a month after hummingbirds have long left the area as humming birds rely on nectar to give them the energy they need to fly. Since Ruby throated hummingbirds are not well adapted to cold, they tend to start their migration late August to early September. Banded studies show that singular hummingbirds may follow the same path every year and visit the same feeders showing up on the same day year after year.
While this may be an interesting folklore that is commonly believed there are so many differences that would make this nothing more than legend, a myth told for fun as there is no way this would work in reality. In truth, these tiny little creatures of wonder migrate solo, powered and helped along only by the beat of their own little wings, carrying them the great distance to their tropical lands they winter in.