In a race between an emu and an ostrich, guess who would win? . . . [VID: How does an emu differ from an ostrich? These large, flightless birds belong to the same family, the ratite. But there are differences between them -- in size, habitat, and speed. The ostrich is the world’s largest bird, measuring nine feet tall and weighing over 300 pounds. The emu is the runner-up, measuring up to seven feet tall and weighing up to 125 pounds. The birds are found on different continents. Emus are native