Examining the invasive species and pests that threaten cities, including bed bugs, termites, cockroaches, rats, mosquitos and coyotes. Cockroaches produce high amounts of allergens and are one of the causes of asthma for children in conurbations. In the USA, coyotes have begun to feed on pets and livestock and can now reach weights of 75 pounds, while in the southern states; mosquitoes have started to spread the West Nile virus.