Just about every method of detecting land mines has a drawback. Metal detectors cannot tell a mine from a tenpenny nail. Armored bulldozers work well only on level ground. Mine-sniffing dogs get bored, and if they make mistakes, they get blown up.

The Gambian giant pouched rat has a drawback, too: It has trouble getting down to work on Monday mornings. Other than that, it may be as good a mine detector as man or nature has yet devised.

Just after sunup on one dewy morning, on a football field-sized patch of earth in the Mozambican countryside, Frank Weetjens and his squad of 16 giant pouched rats are proving it. Outfitted in tiny harnesses and hitched to 10-yard clotheslines, their footlong tails whipping to and fro, the rats lope up and down the lines, whiskers twitching, noses tasting the air.

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