AP BIOLOGY

Detailed explanation-1: -Migratory birds travel long distances during winters, majorly due to the cold weather and lack of food in their region. They travel to places which are warmer and have abundant availability of food. Once the winter season comes to an end, they return back home.

Detailed explanation-2: -When the climate turns cold, birds fly away in groups to places with warmer climates which is suitable for their survival. This phenomenon is called migration.

Detailed explanation-3: -Migratory birds are those that fly out to different parts of the world in the winter to escape the cold. The Siberian Crane and Flamingoes are examples of migratory birds that flock to India during the winter.

Detailed explanation-4: -Avian migration is a natural process, whereby different birds fly over distances of hundreds and thousands of kilometres in order to find the best ecological conditions and habitats for feeding, breeding and raising their young.