"...The idea occurred to Weegens as he realized that rats were both easy to train and had an excellent sense of smell...He founded APOPO, which is a non-profit organization, the aim of which is to train up African Giant Pouched Rats and to deploy them in the field. Not only would the rats be a cheaper alternative to mine clearance methods already in use – he figured that they would be considerably more efficient as well. ...The rats move up and down an area the size of a squash court and when they locate a mine they usually sit still and scratch themselves. After that the mines can be detonated by their human helpers.
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