Migration is the regular seasonal movement, often north and south, undertaken by many species of birds. Bird movements include those made in response to changes in food availability, habitat, or weather. Sometimes, journeys are not termed "true migration" because they are irregular (nomadism, invasions, irruptions) or in only one direction (dispersal, movement of young away from natal area). Migration is marked by its annual seasonality. Non-migratory birds are said to be resident or sedentary. Approximately 1800 of the world's 10,000 bird species are long-distance migrants. COUNT 5
QSN1 Why do birds migrate? ANS1 response to changes in food availability, habitat, or weather QSN2 What are non=migratory birds called? ANS2 resident or sedentary QSN3 How many species of birds are there? ANS3 10,000 QSN4 How many bird species are long distance migrants? ANS4 1800 QSN5 Which direction do birds primarily migrate? ANS5 north and south