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The vandals damaged the petroglyphs at three locations within the rock art site, which is protected under the Archaeological Resources Protection Act and listed in the National Register of Historic Places, according to officials.

They said the monument status helped protect cultural resources, including petroglyphs and centuries-old cave dwellings.

He notes that the study is one of the first to center on rock art engravings, or petroglyphs, in the Amazon.

Some boulders are decorated with petroglyphs older than all of our leading presidential candidates put together.

There also have been others cases of vandalism on federal land across the West over the past decade, with visitors defacing petroglyphs, toppling rock features and pounding climbing bolts into centuries-old rock art.