With the United States containing so many world-Â­famous tourist destinations and being home to three giants of the aviation industry (US Airlines, American Airways, and Delta Air Lines), it's no surprise that the country's airports rank among the busiest in the world, weaving a complex network of routes all over the globe.
Birds, bats and other animals can be used as one of mosquito control methods, but alone they certainly wonât make a visible impact on the population of mosquitoes. Some species of birds like purple martin eat mosquitoes and these insects take few percent of their daily meal and bats, who are night hunters also feed from mosquitoes.
Purple martins suffered a severe population crash in the 20th century widely linked to the release and spread of European starlings in North America. Starlings and house sparrows compete with martins for nest cavities.Where purple martins once gathered by the thousands, by the 1980s they had all but disappeared.ike other members of this genus, they are larger than most of the other swallows. The average length from bill to tail is 20 cm (7.9 in). Adults have a slightly forked tail. Adult males are entirely black with glossy steel blue sheen, the only swallow in North America with such coloration.