After experiencing the amazing amount of Ducks & Geese that winter on our property, Big Valley Outfitters in Cassoday, KS has decided to open a Waterfowl Hunting operation.Cheyenne Bottoms & Quivira National Wildlife Refuge are just a short flight by a Duck or Goose to the west. There are over 2 million ...waterfowl that winter in this area each year. Cheyenne Bottoms is a 41,000-acre lowland basin and is the largest fresh water marsh in the interior of the United States. It is considered the most important shorebird migration point in the western hemisphere. Each year this area attracts 45 to 90% of the North American shorebird population during spring migration. At least 320 species of birds have been recorded. The area is a critical habitat for several threatened and endangered species such as Whooping Cranes, Peregrine Falcons, Least Terns, and Piping Plovers. Thousands of Sandhill Cranes stop here on their spring and fall migrations.