Those teeth are really orange. It's natural coloration not a fashion statement. They are almost as large as an adult beaver and much more fecund (one of my favorite words).
Jefferson Parish Sheriff deputies and swat would shoot - .22's - nutria along bayou levees at night for two reasons: target practice and pest control. These critters denude protective cover from the levees causing erosion and weakness. Nutria strip wetlands of vegetation also causing erosion and wetlands loss. They thrive in fresh and brackish waters.
Several years ago nutria were hunted for fur. PETA and other animal rights groups caused the US fur industry to become less profitable and nutria hunting-for-profit ceased.