Traversing through the Palos Preserves of southwest Cook County, Illinois – the largest concentration of preserved land in the Forest Preserves of the county– is beautiful Crooked Creek. A winding tributary to the Cal-Sag Channel, which is a part of the Chicago River system, Crooked Creek and the surrounding land are fertile habitat for dragonflies and damselflies, including the endangered Hine's emerald dragonfly. It is also home to many fish species including largemouth bass, bluegill, and pumpkinseed.