From a 9/19/2016 New York Times book review
Giant Gambian rats have Keys officials worried. (USA Today, 1/3/2006)
The omnivores, or animals that eat almost everything, could compete for food with endangered species such as the silver rice rat, carry diseases and eat bird eggs.Giant rats reappear in the Keys. (Miami Herald, 6/1/2014)
The African rat species can grow up to nine pounds and reportedly appeared on Grassy Key sometime between 1999 and 2001, when they were released by a resident who had been breeding them.