The giant rodents called nutria are an invasive species of rodent that can grow to three feet from their nose to the tip of their tail.
They are a threat to agriculture because they can wipe out wetlands, disrupting water delivery and flood control systems.
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The U.S. Fish and Wildlife Service says it has captured more than 400 of the animals across the San Joaquin Valley.
The nutria have a weakness for sweet potatoes, so valley farmers have donated five tons worth to help lure the rodents into traps.