Multiple choice The largest flightless bird which can run at a great speed is penguin kiwi ostrich emu Reveal answer Fill a bubble to check yourself C Correct answer Explanation The ostrich is the world's largest flightless bird, standing up to 2.8 meters tall and weighing up to 150 kg. Native to Africa, ostriches can run at speeds up to 70 km/h (43 mph), making them the fastest running birds on land.