The great bustard is one of the heaviest flying birds. They are quite adaptable. You could see them in freezing cold Russia and even in unbelievably hot Spain. However, due to hunting, agriculture changes and other factors, they have made few appearances in the UK since 1832. David Waters, a policeman by profession, founded the Great Bustard Group in 1997. His aim is to see the great bustards thriving in the plains of Wiltshire.