The moa is one of several species of giant, flightless birds that have historically lived in New Zealand. Currently, according to DNA recovered from museum collections, there are ten known species of different sizes, including two species of huge moa. Among them, the giant moa is the largest, reaching a height of 3 meters, which is taller than today's ostriches. . Small moa are only about the size of a turkey. Among the giant moa with an average height of about 3 meters, the largest individual is about 3.6 meters tall and weighs about 250 kilograms. More than 300 years ago, the giant moa was the tallest bird in the world. Although the upper limbs have degenerated, the body of the moa was fat and the lower limbs were stubby. Although the lower limbs are well developed, the huge body makes the moa's running ability far less than that of the ostrich.