Oregon Trail ... Scotts Bluff National Monument Scotts Bluff National Monument Chimney Rock National Historic Site Big Horn Sheep Violet-Green Swallow Chipmunk Moraine Park and Museum Cones Tree Moraine Park Museum Upper Beaver Meadows Beaver Ponds Wildflowers Wildflowers Alpine View Wildflowers Audubon's Warbler Butterfly Alluvial Fan Killdeer House Sparrow Red-Tailed Hawk Scotts Bluff National Monument Scotts Bluff National Monument Scotts Bluff National Monument Scotts Bluff National Monument Scotts Bluff National Monument Sunflower Sunflower Chimney Rock National Historic Site Jailhouse and Courthouse Rocks Ring-Billed Gull Mallard Mallard Mallards Mallard Yellow-Headed Blackbirds Gadwall Gadwall Pair Gadwall Shoe Line Great Tailed Grackle Snowy Egret Red-Tailed Hawk