query: Can all birds fly?
passage: Flightless bird
Flightless birds are birds that through evolution lost the ability to fly.[1] There are over 60 extant species[2] including the well known ratites (ostrich, emu, cassowary, rhea and kiwi) and penguins. The smallest flightless bird is the Inaccessible Island rail (length 12.5cm, weight 34.7 g). The largest (both heaviest and tallest) flightless bird, which is also the largest living bird, is the ostrich (2.7 m, 156kg). Ostriches are farmed for their decorative feathers, meat and their skins, which are used to make leather.
passage: List of birds of the Virgin Islands
Hummingbirds are small birds capable of hovering in mid-air due to the rapid flapping of their wings. They are the only birds that can fly backwards.Order: CoraciiformesFamily: Alcedinidae