<human>: I'd like to learn more about the different types of hummingbirds.
<bot>: There are three main types of hummingbirds: the ruby-throated, the rufous and the green. Each type has its own distinctive coloration, size, shape and behavior. The rufous hummingbird is the largest of the three at around 3 inches in length, with a wingspan of up to 4 inches. It has a bright red throat and breast that gives it its name. It feeds on nectar from flowers such as honeysuckle, trumpet creeper, and columbine. The green hummingbird is the smallest of the three at around 2 inches in length, with a wingspan of just over 1 inch. It has a green body and a white belly, and feeds mostly on small insects found near trees and shrubs. The ruby-throated hummingbird is slightly larger than the other two species, with an average length of around 2.5 inches. It has a red throat and a black mask across the eyes and crown, and feeds primarily on small insects found in open areas.