(Omaha, NE) -- Hundreds of millions of birds will be migrating north this weekend.
The Birdcast NexRad radar forecast shows more than 200-million birds will migrate Saturday with the largest number flying up the Missouri and Mississippi River valleys.
The area from Omaha/Council Bluffs through Iowa to the Quad Cities is the heaviest flight path.
The birds fly at night, starting about three hours after sunset, and stop to sleep and eat the next morning, wherever they are along the route, including back yards.
On Sunday, another 300-million birds will migrate north, with the heaviest flight path stretching from Eastern Nebraska through Iowa and Illinois into Minnesota and Wisconsin.
(NexRad Radar map from Birdcast by Colorado State University and the Cornell Lab of Ornithology)