Cattle Egret Long-Billed Curlew Gull-Billed Tern Wilson's Plover Laughing Gull Common Tern Royal Tern Sandwich Terns Willet Black-Bellied Plover Ruddy Turnstone Black Skimmer Black Skimmer Skimming Kingbird Green Heron Black-Bellied Whistling-Duck Plain Chachalaca Crimson-Collared Grosbeak Black-Crested Titmouse Clay-Colored Thrush Immature Yellow-Crowned Night-Heron White Ibis Least Bittern American Avocet Peacock Thirteen-Lined Ground Squirrel Pawnee Grasslands Birding Tour Red-Winged Blackbird Sing Out Loud Greater Roadrunner Killdeer Black Phoebe Green-Winged Teal (male) Green-Winged Teal (female) Thayer's Gull Thayer's Gull Thayer's Gull Gadwall Ring-Necked Duck Pair Northern Pintail Northern Pintail Pair Northern Pintail American White Pelican American White Pelican Rusty Blackbird