09/09/2026
Michigan skies are expected to be busy tonight as an estimated 13.4 million birds migrate over the state during their annual journey south.
Fall migration is underway across North America, with huge numbers of birds leaving breeding grounds in Canada and the northern United States as temperatures cool and food becomes less abundant. Many will eventually reach wintering grounds in the southern United States, Mexico, Central America and South America.
Michigan sits along an important migration corridor. The Great Lakes have a major influence on how birds travel through the region, with large bodies of open water shaping their routes and concentrating movement along shorelines and across the state’s peninsulas. Michigan’s forests, wetlands and coastal habitats also provide important places for migrating birds to stop, feed and regain energy before continuing their journeys.
Much of this movement happens without us ever seeing it. A large percentage of migratory bird species travel at night, when conditions can be cooler and calmer. Scientists are able to track these movements using weather radar, which detects enormous numbers of birds moving through the atmosphere after sunset.
During particularly heavy migration nights, residents are encouraged to turn off unnecessary outdoor lights and close blinds or curtains when possible. Artificial light can attract and disorient migrating birds, increasing the risk of collisions with buildings.