Hummingbirds are the tiniest birds on the planet.
There are a LOT of different hummingbirds between these extremes. This huge family has about 320 species. The biggest variety is found in the equatorial belt, ten degrees wide, across South America, where more than half the species are found. Moving north, the number of species declines. Fifty-one species breed regularly in Mexico, thirteen in the United States, and four in Canada.