The smallest of living birds are included among the Trochilidae, the smallest known species being the bee hummingbird (Mellisuga helenae) of Cuba, which is barely 62 mm (about 2.5 inches) from bill tip to tail tip. Even the largest member of the family, the giant hummingbird (Patagona gigas) of western South America, has a body only about the size of a large sparrow, although the bill and tail extend this length by about 35 and 85 mm (1.4 and 3.3 inches), respectively. There is relatively little structural diversity among hummingbirds except in the size and shape of the bill and the ornamental feathers. The bill may be very short or, as in the sword-billed hummingbird (Ensifera ensifera) of the Andes, may exceed the rest of the bird in length. The bill may also be straight or curved to varying degrees, usually downward, but, in a few species, upward. In most hummingbirds, the tail feathers are relatively unspecialized. However, in some they are greatly elongated and are either straight or curved, and in others the tail feathers are wirelike with spatulate tips. Brilliantly iridescent feathers are found somewhere on the body of most hummingbirds, often with an especially colourful gorget on the throat; a few genera have dull coloration. Sexual dimorphism (that is, the structural difference between sexes) varies between species, females being either indistinguishable from males or less colourful or ornate.