Nerissa Michaels/Illinois River Biological Station via the Detroit free Press/AP Photo
  • Invasive Species

    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
  • Invasive Species

    A northern snakehead fish swims in a tank at the Academy of Natural Sciences April 28, 2005 in Philadelphia, Pennsylvania. Richard Horwitz, a senior biologist with the Academy of Natural Sciences and his team caught 15 northern snakehead, whose scientific name is Channa Argus, in FDR Park two days ago. The northern snakehead can grow to several feet in size, crawl on land for short distances, and is native to Asia and Africa. Scientists fear the fish, with its voracious appetite, can destroy or severely harm the ecosystem.
    William Thomas Cain/Getty Images
  • Invasive Species

    Axis and fallow deer, with antlers, are seen Sunday, Feb. 20, 2005, near Bear Valley at Point Reyes National Seashore, Calif. Park rangers at Point Reyes National Seashore want to eliminate hundreds of exotic deer that were introduced for hunting more than 50 years ago, but now threaten native bird, mammal and plant species. But the national park's plan to wipe out the deer by shooting and sterilizing them faces opposition from animal-rights activists.
    Ben Margot/AP Photo
  • Invasive Species

    This handout photo from the U.S. Department of Agriculture, taken in September 2006, shows cactus moth caterpillars on prickly pear cactus pulp. The invasive species from Argentina was recently found in Louisiana, 20 years after it was first found in Florida. Entomologists hope to keep the moths from reaching Texas, where they could devastate cacti needed for the ecology and raised as a specialty crop, by killing infested cactus in Louisiana and releasing sterile male moths.
    Peggy Greb/U.S. Department of Agriculture/AP Photo
  • Invasive Species

    Field technician with the Oahu Invasive Species Committee (OISC), Brian Caleda holds a Coqui frog from an infested forest area of Wahiwa, Oahu, Monday, June 27, 2005. The OISC is making an effort to eradicate the pest from the island.
    Ronen Zilberman/AP Photo
  • Invasive Species

    This undated photo provided by the U.S. Department of Agriculture shows a group of zebra mussels, taken from Lake Erie. Dozens of foreign species could spread across the Great Lakes in coming years and cause significant damage to the environment and economy, despite policies designed to keep them out, a federal report says. The National Center for Environmental Assessment issued the warning in a study released in Jan. 2009.
    U.S. Department of Agriculture/AP Photo
  • Invasive Species

    This juvenile Lionfish, measuring between three and four inches long, was discovered by divers from the New England Aquarium in the Alantic waters of the Bahamas, the aquarium announced during a press availability Thursday, May 4, 2006 in Boston. The discovery of this invasive venomous species, native to the Pacific, seems to confirm it is now breading in the Alantic.
    Stephan Savoia/AP Photo
  • Invasive Species

    Invading species 'threatening wildlife worldwide'.File photo dated 10/04/08 of grey squirrel eating a nut in St. James Park in London. A study of 57 countries co-ordinated by the Global Invasive Species Programme found 542 types of animals and plants had invaded places where they are not naturally found and were putting native wildlife at risk. Issue date: Friday January 22, 2010. Examples of non-native species causing problems in the UK include grey squirrels, whose spread has led to widespread declines in red squirrels, the rampant weed Japanese knotweed, American signal crayfish and water primroses. See PA story ENVIRONMENT Invasive.
    Clive Gee/PA Wire/AP Photo
  • Invasive Species

    A Cane Toad is exhibited at Taronga Zoo August 9, 2005 in Sydney, Australia. The Cane Toad, which is poisonous, is reportedly being blamed for the deaths of a number of Australia's most dangerous predator, the Salt Water Crocodile. A three-metre long crocodile was found dead by a local crocodile tour operator last week in the Adelaide River, with the tourism operator suspecting the reptile had been poisoned after eating a toad. The director of Wildlife Management International, Graeme Webb, says he suspects that up to
    Ian Waldie/Getty Images
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