The inability to fly is the antithesis of birds, right? In fact, there are over 60 species worldwide that cannot get off the ground. That flightless birds are descended from birds that could fly is commonly accepted among scientists. What is not completely clear, however, is why these birds lost the ability to fly. One theory suggests that flight became unnecessary for ancient birds that colonized habitats without predators, because those birds no longer needed that adaptation to escape. You are aware of penguins, ostriches and kiwis but learn more about other fascinating birds that have left flight behind...
