Most bird species migrate during the year in order to find better resources such as food and shelter. The migration cycles depend not only on the bird species, but also the bird's current location.
Birds that live in the northern part of the world will migrate north to find better food and better nesting spots when spring comes but then move south when the colder weather comes in. Most birds tend to migrate south in order to avoid colder temperatures such as the hummingbird and geese. Migration comes in three forms: short-distance migration, medium-distance migration and long-distance migration. The long-distance migration patterns depend on the bird species genetics while the other two migration patterns are a direct result of a need for better resources.