What kind of birds are there

https://www.audubon.org/important-bird-areas/salt-plains-national-wildlife-refuge

The salt flats and the large expanse of marshes north of the flats draw many birds. The endangered Whooping Crane overwinters in the marshes north of the flats. Locals brag that this area is known as the "Goose Hunting Capital of Oklahoma."

All I saw were ducks

I didn't see any when I went