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 availability of food. It occurs mainly in the northern hemisphere, where birds are funnelled on to specific routes by natural barriers such as the Mediterranean Sea or the Caribbean Sea. COUNT 5
QSN1 Where does migration mainly occur? ANS1 the northern hemisphere QSN2 Why do birds primarily migrate? ANS2 availability of food QSN3 Which birds migrate? ANS3 Many species QSN4 What is bird migration? ANS4 the regular seasonal movement, often north and south along a flyway, between breeding and wintering grounds QSN5 What is a cause of death to birds during migration? ANS5 humans