it just looks that way when in a defensive behavior.
This ratite (flightless) is the world's largest bird at 220 pounds and 6 to 9 feet tall. Ostriches don't need to drink - they generate water internally from the plants they eat. Hunted in the wild nearly to extinction in the 18th century, ostriches are now farmed for meat, leather and feathers. One ostrich egg weighs as much as two dozen chicken eggs.
Ostriches can sprint up to 43 miles an hour with a 10 to 16 foot stride. A kick from a clawed, two-toed foot can kill a human or a lion. See an Ostrich on the run: