GRASSY KEY, Florida (Reuters) - Deep in the heart of the Florida Keys, wildlife officials are laying bait laced with poison to try to wipe out a colony of enormous African rats that could threaten crops and other animals. U.S. federal and state officials are beginning the final phase of a two-year project to eradicate the Gambian pouched rats, which can grow to the size of a cat and began reproducing in the remote area about eight years ago. "This is the only place in the United States where this is occurring," said Gary Witmer, a biologist with the U.S. Department of Agriculture's National Wildlife Research Center in Fort Collins, Colorado.   read the whole article