AP BIOLOGY

Detailed explanation-1: -During the winter months, when insects and other food become scarcer, birds tend to migrate south. As long as an adequate supply of food is available, several species, such as hummingbirds, can withstand freezing temperatures as long as they can escape the cold.

Detailed explanation-2: -Some birds such as Pintail Ducks, Curlews, Flamingos, Ospreys and Little Stints migrate to our country in the winter season every year.

Detailed explanation-3: -As winter approaches and the availability of insects and other food drops, the birds move south again. Escaping the cold is a motivating factor but many species, including hummingbirds, can withstand freezing temperatures as long as an adequate supply of food is available.

Detailed explanation-4: -Ans. Birds must remain warm to survive. So, they migrate to warmer regions when winter sets in and they come back after the winter is over. Example: Siberian cranes migrate from Siberia to places like Bharatpur in Rajasthan and Sultanpur in Haryana, and some wetlands of north east and some other parts of India.