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The emu (Dromaius novaehollandiae) is the largest bird native to Australia and the only extant member of the genus Dromaius. It is also the second-largest extant bird in the world by height. The soft-feathered, brown, flightless birds reach up to 2 m (6 ft) in height. The emu is common over most of mainland Australia, although it avoids heavily populated areas, dense forest and arid areas. Emus can travel great distances at a fast, economical trot and can sprint at 50 km/h (30 mph) for some distance at a time. They are opportunistically nomadic and may travel long distances to find food; they feed on a variety of plants and insects. The emu subspecies that inhabited Tasmania became extinct following the European settlement of Australia in 1788. The distribution of the mainland subspecies has also been affected by human activities. Once common on the east coast, the emu is now uncommon, while development of agriculture and provision of water for stock in the interior of the continent have increased the range of the emu in arid regions. Emus are farmed for their meat, oil and leather.