Concept:Migration :The organism can "move away temporarily from the stressful habitat to a more hospitable area and return when the stressful period is over". Or in other words "The phenomenon of movement of a species from its own habitat to some other habitat for a particular time period every year for a specific purpose like - feeding & breeding."Every winter the famous Keoladeo National Park (Bharatpur) in Rajasthan hosts thousands of migratory birds coming from Siberia and other extremely cold northern regions.ExplanationThe smallest migratory bird - Little Stint Weighing as low as 15 grams, from the Arctic region travel over 8000 km to reach India.Migration is common among birds.Birds migrate in search of - food, shelter, and reproduction.Examples of Migratory Bird include - Flamingos, Cuckoo, Black-crowned Night Heron, Asian Koel.Additional InformationSome birds such as - Pintail Duck, Curlews, Flamingo, Osprey, and Little Stint migrate to our country in the winter season every year. The Arctic tern has the longest migration journey of any bird, it flies from its Arctic breeding grounds to the Antarctic and back again each year, a distance of at least 19,000 km (12,000 mi), giving it two summers every year.