After two years of scanning Peru’s southern Pacific coast with drones, taking aerial photos, and conducting field surveys, researchers and archeologists have discovered 168 additional geoglyphs in the mysterious Nazca lines.

The massive, carved trenches — attributed by some to aliens — are the latest addition to over 800 straight lines, 300 geometric figures, and 70 animal and plant designs, which also called biomorphs, according to National Geographic.

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The recently discovered carved figures average between 6 and 19 feet in length and include the outlined figures of cats, snakes, killer whales, and alpacas, according to a statement released by Yamagata University, which led the research. Previously known lines measure as long as 1,200 feet.

Read more: yahoo