Captured in Mindo cloud forest,Ecuador.Hummingbirds are birds from the Americas that constitute the family Trochilidae. They are among the smallest of birds, most species measuring 7.5 to 13 cm (3 to 5 in). Indeed, the smallest extant (not extinct) bird species is a hummingbird, the 5-cm bee hummingbird weighing less than 2.5 g.