In this photo taken on Dec. 13, 2013, a family of young nutria nibble the grass along the shores of Capitol Lake in Olympia, Wash. Nutria, a destructive aquatic rodent native to South America, have invaded the Sacramento San Joaquin Delta.
In this photo taken on Dec. 13, 2013, a family of young nutria nibble the grass along the shores of Capitol Lake in Olympia, Wash. Nutria, a destructive aquatic rodent native to South America, have invaded the Sacramento San Joaquin Delta. Tony Overman AP
In this photo taken on Dec. 13, 2013, a family of young nutria nibble the grass along the shores of Capitol Lake in Olympia, Wash. Nutria, a destructive aquatic rodent native to South America, have invaded the Sacramento San Joaquin Delta. Tony Overman AP