Animals start to migrate from their native to some other places at a particular time due to the climatic changes. Usually birds move from one part of the world to another part during a particular time because of climatic changes. These birds are said to be migratory birds. The main reason behind their migration is for laying eggs as the weather in their habitat becomes very cold and not suitable for incubation.
Foreign birds visit Vedanthangal Wild Life Sanctuary located at Tamil Nadu during the month of November to April of every year.