The understanding of nature was Ralph Simpson's consuming passion, which he pursued with unmatched vigor and high spirits. In Grass Flats, 1890--1923, Simpson meticulously documents 218 species accounts of bird life in Warren County, Pennsylvania, including notes on other species observed at Presque Isle on Lake Erie. Simpson speaks of habitat preferences and population shifts, while at the same time offering a view of the natural world with a bit of whimsy, as in the following 1909 observations of the Screech Owl. "I knew of an old Flicker's hole nearby, and on going past I saw feathers about the edges, so I investigated and found a Gray Screecher at home. She made no resistance, so I reached in and counted five eggs under her, petted her, and left her." Join this noted naturalist, as he seeks adventure birding in the virgin timber of Wild Cat Run, navigating a steep precipice in the wilds of Goshawk Basin, or climbing 70 feet up a giant Eastern Hemlock to peer into a Sharp-shinned Hawk's nest. From his exploits, Simpson learned early on that, with nature, every moment instructs. Simpson, with feet on terra firma, beckons you to his stomping ground--Grass Flats.