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: -They usually migrate from unfavourable locations to some favourable places which are having suitable conditions along with sufficient food and water resources and are also safe as well. The majority of the birds migrate during the breeding season and others migrate for food resources and because of change in seasons.

Detailed explanation-3: -Avian migration is a natural miracle. Migratory birds fly hundreds and thousands of kilometres to find the best ecological conditions and habitats for feeding, breeding and raising their young. When conditions at breeding sites become unfavourable, it is time to fly to regions where conditions are better.

Detailed explanation-4: -Expert-Verified Answer. Migratory birds migrate to warmer regions during winter and return during summer. Explanation: Fieldfares, Redwings, Bramblings, Bewick’s and whooper swans are some of the Avian members and many kinds of ducks, geese and wading birds do migrate and are thus called migratory birds.

Detailed explanation-5: -Birds that migrate have natural features that help them in their journeys. A majority of migratory birds have longer and more pointed wings than non-migratory birds or birds with shorter migrations. This aerodynamic wing structure helps to reduce air resistance during flights, thus allowing for more efficient flights.