The U.S. is suffering through several invasive-species issues, including the recent Asian carp catastrophe and the continued threat of snakeheads.
Folks in Tokyo, Japan recently spotted an intruder in the Tokyo River – a sizable alligator gar, which is native only to parts of the U.S. and Mexico.
Several Japanese news sites have covered the spottings, but for a good English overview, check out Cryptomundo.com.