Pack Rat Piles: Rodent rubbish provides ice age thermometer

For a person, life as a pack rat is one of obsessively collecting, say, newspapers, computer parts, food containers, or maybe all of these. But a literal pack rat gathers plant fragments, bone bits, fecal pellets, and even, occasionally, eyewear.

“A friend of mine lost his glasses to a pack rat,” says Kenneth Cole of the U.S.