Formation of geese is a common sight in the sky, especially during migration season. The term 'formation of geese' refers to the V-shaped pattern that geese fly in when they are migrating. This formation helps them conserve energy and fly more efficiently. The V-shape is created by the lead goose, which is followed by the other geese in the flock. The lead goose changes periodically, allowing each bird to take a break from the front of the formation.