Five Years After Katrina, Big Alien Rodents Return

But boom in trappers keeping wetland-eating, beaver-size nutria in check.

At the same time, some coastal marshes are rebounding too, because of a boom in Louisiana's nutria trappers.

(See "Hurricane Katrina Pictures: Then & Now, Ruin & Rebirth.")

The 2005 to 2006 trapping season, which runs from November 20 to March 31, yielded 168,843 nutria tails. The 2009 to 2010 season, by contrast, set a record: 445,963 nutria tails, according to state figures. Trappers hunt the rodents for money and discard their carcasses.

"The amount of animals harvested this past year is a result of economics in the area," said Edmond Mouton, who heads the Nutria Control Program with the Louisiana Department of Wildlife and Fisheries in

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