Hi Urban, I wasn't able to get the article you posted to come up, just got an error.
But, I know it's true that hummingbirds will return year after year. They've been doing so here for about 14 years now. Well, it started out as two hummingbirds back then and now there must be a hundred of them that return like clockwork, year after year. They breed here and have nests in the trees. Maybe they use the same trees every year too, if its still available.
And, if I didn't put the feeders out for them as soon as they arrive in the spring, they would move on to find another reliable source of nectar.
