Alien Invaders
Non-native species animals can throw off entire ecosystems.
PHOTOS: Asian Carp and Other Alien Animal Invaders
This early Dec. 2009 photo provided by the Illinois River Biological Station via the Detroit Free Press shows Illinois River silver carp jump out of the water after being disturbed by sounds of watercraft. Michigan and other Great Lakes states have asked the U.S. Supreme Court to order shipping locks separating the Great Lakes from the Mississippi River basin closed immediately to prevent the Carp from entering the Great Lakes. (Nerissa Michaels/Illinois River Biological Station via the Detroit free Press/AP Photo )
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