"The Giant Rats That Save Lives"

MALANJE, Angola — I’M walking in a minefield here in rural Angola, tailing a monster rat.This is a Gambian pouched rat, a breed almost 3 feet from nose to tail, the kind of rat that gives cats nightmares. Yet this rat is a genius as well as a giant, for it has learned how to detect land mines by scent — and it’s doing its best to save humans like me from blowing up.These rodent mine detectors have been dubbed HeroRats, and when you’re in a minefield with one that seems about right. You’re very respectful, and you just hope this HeroRat doesn’t have a stuffed nose.