The December, 1990 Earthwatch magazine has an article on analysis of mammoth dung from Arizona caves to determine diet before the mammoth extinction in 11,000 B.C. The study so far seems to show that food was still plentiful, even in the latest samples tested, probably indicating that extinction was due to hunters killing the animals. The writeup is also interesting for the wide variety of words used to refer to the topic. These included the following terms: amorphous mass, ancient droppings, bolus, chunk of dung, coprolites, dung, dung ball, dung layers, dung pie, dunghills, fossilized excrement, Hope Diamond of Mammoth Dung, intestinal contents, mammoth bolus, mammoth dung, mammoth pies, manure, original crumbly dung, pie, rejectamenta, scatological time capsules, scraps of dung, and waste of time.