"Some of southern Illinois’ best birding is done at springtime in Giant City State Park, although breeding season has its own rewards. Within the park you should easily find both species of tanagers, Pileated Woodpeckers, Wood Thrushes, several vireos, and at least 12 breeding warbler species, including Louisiana Waterthrush, Worm-eating, Prairie, Pine, and Cerulean.
Black Vultures and Fish Crows fly over the park, sometimes stopping on a tree to give birders a good view. In fall and winter, Pine Warblers, Indigo Buntings, and Common Yellowthroats sometimes linger in the park. Key birds: Migratory passerines; Fish Crow, Black Vulture; breeding Pileated Woodpecker, Whip-poor-will, Eastern Bluebird, Wood Thrush, 12 species of warblers, Summer and Scarlet Tanagers, and Orchard Oriole. This eTrail provides detailed information on birding strategies for this specific location, the specialty birds and other key birds you might see, directions to each birding spot, and helpful general information."