Hummingbird
Hummingbirds are birds native to the Americas and constitute the biological family Trochilidae. They are among the smallest of birds, most species measuring in length. Indeed, the smallest extant bird species is a hummingbird, the bee hummingbird weighing less than .
Bee hummingbird
The bee hummingbird is the smallest living bird. Females weigh and are long, and are slightly larger than males, with an average weight of and length of . As its name suggests, it is scarcely larger than a bee. Like all hummingbirds, it is a swift, strong flier.