geese fly in a v formation when migrating.

Geese fly in a V formation during migration primarily to conserve energy. The lead bird creates an updraft that reduces wind resistance for the birds that follow, allowing them to expend less energy. This aerodynamic advantage helps the entire flock fly longer distances with less fatigue. Additionally, flying in this formation aids in communication and coordination within the flock, allowing the birds to maintain visual contact and vocalize effectively. Geese also take turns leading the formation to share the workload and prevent any one bird from becoming overly tired. This collective behavior optimizes their migratory efficiency and endurance.