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: -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-3: -Bird migration is the regular seasonal movement, often north and south, along a flyway, between breeding and wintering grounds. Many species of bird migrate. Migration carries high costs in predation and mortality, including from hunting by humans, and is driven primarily by the availability of food.

Detailed explanation-4: -Bird migration is the regular seasonal movement, often north and south along between breeding and wintering grounds. Birds migrate mainly due to the changing climate and also in search of food.

Detailed explanation-5: -Birds mainly migrate for breeding or in search of food due to environmental factors like weather, season etc. Animals migrate in search for suitable shelter, food and suitable place for breeding.