Filmed in Pottawatomie County, Iowa: just west of Hitchcock Nature Center; just east of Omaha, NE. The hills you see are loess: glacial sediment blown by the wind. Loess hills as large and as extensive as these exist only in China and western Iowa. The loess hills of Iowa are a national treasure and and unique in all the world.
I got lucky one day timelapsing a controlled burn and a soybean harvest when a swarm of starlings appeared above me: it lasted for 10, maybe 20 minutes. The opening sequence was shot that first and most serendipitous day.
This was shot with the 5Dmk2 and the canon 70-200 IS 2.8.