Hummingbirds are arriving in Texas and the visitor center has 7 feeders hanging on the porch, all of which were filled with hummingbirds while we were there. The most likely species you will see is the Black-chinned hummingbird, but we also saw a few migrating Ruby-throated hummingbirds. A pair of binoculars is more than enough, but we were able to get some good pics using a spotting scope (below).
Painted Bunting (male) - pictured below
Summer Tanagers (male and female) - male pictured below
Yellow-breasted Chat - pictured below
Bell's Vireo
Black and White Warbler
Black-crested Titmouse
Spotted Towhee
Hermit Thrush - pictured below
Cardinals
Cedar Waxwings - pictured below
Common Ground Doves
White-winged Doves
Brown-headed Cowbirds
Lark Sparrows
Field Sparrows
Black-throated Sparrows - pictured below
Chipping Sparrows
White-crowned Sparrows - pictured below
Lincoln's Sparrows
Clay-colored Sparrows
Eastern Phoebe
Blue-gray Gnatchatchers
http://www.tpwd.state.tx.us/state-parks/south-llano-river