For years, environmental groups in numerous countries have warned about the potential escape of genetically engineered animals into the wild. Now it has happened. Researchers in Brazil have published a paper documenting the escape and successful reproduction of genetically engineered (genetically modified or GM) aquarium fish in the wild. The fish, which contains a gene from the jellyfish family to make them fluorescent, has unknown consequences for freshwater systems in Brazil. This is the first documented case of a genetically engineered animal breeding in the wild. Read more.