5. Which birds are called flightless birds and why?
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Flightless birds are birds that through evolution lost the ability to fly. There are over 60 extant species, including the well known ratites (ostriches, emu, cassowaries, rheas, and kiwi) and penguins. The smallest flightless bird is the Inaccessible Island rail (length 12.5 cm, weight 34.7 g).
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Flightless bird, any of several birds that have, through evolution, lost the ability to fly as they adapted to new environments. Most living forms belong to the order Struthioniformes (a group that includes the ostrich, the rhea, the cassowary, the kiwi, and the emu); however, they are more commonly known as ratites.
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