The House Sparrow was introduced into Brooklyn, New York, in 1851. By 1900 it had spread to the Rocky Mountains. Two more introductions in the early 1870s, in San Francisco and Salt Lake City, aided the bird’s spread throughout the West. House Sparrows are now common across all of North America except Alaska and far northern Canada. Mankind is a rapidly increasing, social species whose industrial abilities allow the colonization of virtual wilderness and the building of sprawling metropolises. Humans live virtually everywhere on earth and wherever they settle the humans significantly transform the natural habitat. Human populations in India are alarmingly increasing in urban and rural areas. In 1700, only 14 cities with populations of more than 200,000 people existed. By 1900, 42 cities of four continents had such populations, and by 2000, 171 cities of five continents had a population of greater than 2,00,000. In 1900, only 10% of humans lived in cities; by 2000 nearly 50% did and nearly 70% are expected to do so by 2050. Thus by 2050 nearly as many humans are expected to live in cities (6.5 billion) as occupy all of earth today (Ramachandra and Sudhira, 2011)