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Another alien invader that is of concern today in North America is the Northern snakehead (Channa argus), an aggressive predator that feeds opportunistically on amphibians, fish, aquatic birds, and small mammals. Of greater concern is the snakehead fish's ability to survive in waters with low dissolved oxygen and to travel across land. Reproducing populations of snakeheads have now been discovered in Maryland, California, and Florida. Individual fish have also been caught in Maine, Massachusetts, Rhode Island and Hawaii. (Photo credit: U.S. Geological Survey, Florida Integrated Science Center)

Another alien invader that is of concern today in North America is the Northern snakehead