Snow Geese. Huge flock of snow geese migrating through rural central Illinois, about 3 miles north of Farmersville, IL, just west of Interstate 55, south of Thomasville.
Over 10,000 birds in the huge flock. Landed in several locations in corn fields, and then took off in huge flock, flying over area in flock for over one mile at times.
2/10/2018 - 1230 to 1245pm and then 115 to 200pm