What do the Ostrich, Kiwi, penguin, and Giant Coot have in common? Yes, they’re all birds—but none of them can fly. In fact, there are over 60 species of flightless birds, including all the Ratities (the family that includes the Ostrich, Rhea, Emu, and similar species) and all the penguins (in spite of the evidence in this video):

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