Tommy Goszewski, a technician with the U.S. Geological Survey, holds a grass carp taken from a pond at an agency lab in Columbia, Mo., in spring 2013. AP hide caption
invasive species invasive species
A Russian sow on Mark Baker's farm. Four other parties have joined Baker's lawsuit against the Michigan Department of Natural Resources. Courtesy of Long Haul Productions hide caption
The bilby is an endangered Australian marsupial that has been run out of its habitat by humans and rabbits. Courtesy of Australia's Queensland State Government. hide caption
A snakehead is filleted for a dinner this week hosted by the Oyster Recovery Partnership.
John Rorapaugh hide caption
Two Asian carp on display during a February, 2010 congressional hearing. Manuel Balce Ceneta/AP hide caption