Variations in the mid-continent region explains a lot of variation in overall numbers. And they're also helping out because it's fun. Volunteer Terry Shaffer from the center said he doesn't mind the evening work. Plus it's enjoyable. With landowners' permission, they're using five circular traps set on private lands around Jamestown or on the National Audubon Society's Alkali Lake Sanctuary.
Ducks swim into the traps to eat the barley inside.
Seven nights a week some of the volunteers go out to remove the ducks, band them and release them.