Flightless birds are birds that cannot fly, as they have, through evolution, lost the ability. There are over 60 extant species, including the well-known ratites (ostriches (Struthio), emus (Dromaius), cassowaries (Casuarius), rheas, kiwis (Apteryx)), and penguins (Sphenisciformes).
Flightless birds are birds that cannot fly, as they have, through evolution, lost the ability. There are over 60 extant species, including the well-known ratites (ostriches (Struthio), emus (Dromaius), cassowaries (Casuarius), rheas, kiwis (Apteryx)), and penguins (Sphenisciformes).
Source: Wikipedia "Flightless bird" · CC BY-SA 4.0
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