The Common Ostrich (Struthio camelus) is the worlds’ biggest and heaviest bird. Their height can reach up to 9 feet (2.7 meters) with a maximum weight of 346 pounds (157 kg). Common Ostriches are flightless birds that originated from Africa. These flightless birds have the reputation for being one of the fastest land animals on the planet, running up to speeds of 43 mph (70 km/h).