Migratory formation is a type of formation flying used by birds, bats, and some insects. It is characterized by the animals flying in a V-shaped pattern, which is why it is often referred to as a VEE formation. This type of formation allows the animals to conserve energy while flying long distances, as the air currents created by the wings of the lead animal can be used by the other animals in the formation. Additionally, the formation provides protection from predators, as the animals can spot them more easily when they are flying in a group.