Fall bird migration is underway. See the map of where birds are flying tonight

Millions of birds are expected to take flight across the U.S. Saturday night, Sept. 6, as part of their fall migration, according to a nonprofit that tracks bird migrations, although numbers in Michigan may be lower than other areas.

Birds that summer in the northern U.S., Canada and areas around the Arctic Ocean are predicted to fly over the continent from early September through October en route to southern U.S. and tropical areas for the winter, according to BirdCast a migration-tracking website, operated by The Cornell Lab , Colorado State University and the University of Massachusetts Amherst .

Over Michigan on Friday night, Sept. 5, BirdCast's surveillance radar recorded about 1,008,300 birds crossing the state . About 2.8 million birds in total were in flight over Mich