What is the largest living bird that does not fly?

The largest living bird is the ostrich (Struthio camelus), a flightless ratite species. An adult ostrich can be up to 9.2 feet (2.8 m) tall and weigh up to 340 pounds (155 kg). An ostrich EGG can weigh up to 3 pounds (1.4 kg), more than most of the world's birds.

Although unable to fly, ostriches can run at up to 45 mph (70 kph), faster than any other bird.