The Great bustard (Otis tarda), is a species of bustard in the Otididae family. It is the only member of the genus Otis. It breeds in open grassland and farmland in southern and central Europe, and across temperate Asia. European populations are mainly resident, but Asian birds move further south in winter. Portugal and Spain now contain about 60% of the world's population. It has been extinct in Great Britain since the last bird was shot in 1832. Recent attempts to reintroduce it into the UK have met with limited success. It is classified by the IUCN as "vulnerable".