Migration formation is a term used to describe the way in which birds fly in large groups. It is characterized by the birds flying in a V-shaped formation, which is why it is sometimes referred to as a VEE formation. This type of flight pattern is believed to be beneficial for the birds, as it allows them to conserve energy and travel further distances. The birds also take turns leading the formation, allowing them to rest while another bird takes the lead. Migration formation is an important part of bird migration, and is seen in many species of birds.