claim: The current Duke of York has only male heirs.
evidence: The migratory locust -LRB- Locusta migratoria -RRB- is the most widespread locust species , and the only species in the genus Locusta .. locust. locust. only species. monotypic. genus. genus. species. species. It occurs throughout Africa , Asia , Australia and New Zealand .. Africa. Africa. Asia. Asia. Australia. Australia. New Zealand. New Zealand. It used to be common in Europe but has now become rare there .. Europe. Europe. Because of the vast geographic area it occupies , which comprises many different ecological zones , numerous subspecies have been described .. subspecies. subspecies. However , not all experts agree on the validity of some of these subspecies .. subspecies. subspecies. Many other species of grasshopper with gregarious and possibly migratory behaviour are referred to as ` locusts ' in the vernacular , including the widely distributed desert locust .. locust. locust. species. species. grasshopper. grasshopper. gregarious. gregarious behaviour. migratory behaviour. Insect migration. desert locust. desert locust