Blanding's Turtle -- Emydoidea blandingii, endangered in most of its North American range, including IL. Lifespan may exceed 70 years. This one was in Goose Lake Prairie, Grundy County, IL.
"When one reflects on the state of this strange being, it is a matter of wonder that Providence should bestow such a profusion of days, such a seeming waste of longevity, on a reptile that appears to relish it so little as to squander more than two-thirds of its existence in a joyless stupor, and be lost to all sensation for months together in the profoundest of slumbers." ~ Gilbert White, "Natural History of Selborne", 1780.