Scientists all over the world are injecting genes into animals that are foreign to their systems, for example, a jellyfish gene into a rabbit to make it glow in the dark. The reason they want the rabbits to glow is so that they can be seen and shot at night. Another issue is the injection of genes into fish to make them grow faster. Eventually there will be too many fish and the food chain will be mucked up. They are also injecting cows with genes to make their muscles grow to enormous sizes for shows and competitions.