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 flightless bird in the world, after its ratite relative, the Ostrich. The soft-feathered, brown birds reach up to 2 m in height and weigh up to 45 kg. The Emu is common over most of mainland Australia, although it avoids heavily-populated areas, dense forest and very arid areas. Emus can travel great distances at a fast, economical trot and, if necessary, can sprint at 50 km/hour (31 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. The Emu was once common on the east coast, but is now uncommon there; by contrast, the development of agriculture and the provision of water for stock in the interior of the continent has increased the range of the Emu in arid regions. Emus are farmed for their meat, oil and leather.