(LiveScience) Manmade mounds shaped like orcas, condors and even a duck may be the oldest evidence of animal mounds outside of North America, according to former University of Missouri anthropologist.

Writing in the magazine Antiquity, Robert Benfer, a professor emeritus, describes a series of mounds, some more than 1,300 feet (400 meters) across, in coastal valleys in Peru. Archaeological evidence at the sites pegs some at more than 4,000 years old.

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