This book contains all aspects about the migration of birds. There are various types in migration of birds and so is the expanse. The main reason behind the migration of birds and is the climate; which also relates to the availability of food due to climate and housing.
Migration is seasonal but these are certain norms in flight during migration mentioned in this book. Birds choose the place of migration according to the food availability. Suitable climate and the competition with the local birds. There also are various types of migrations like horizontal migration, north to south migration, south to north and within continents. The sea birds also opt for migration. There also are other factors for successful migration including the human intervention due to which the birds die in between. The book has all the basic facts about migration of birds quite informative.