Paleontologists have unearthed a multitude of fossil footprints in sediments in northwest Argentina, and now there is a burning question they would love to answer: What left the tracks?
NO BODY. Scientists haven’t yet found the remains of the creatures that made these birdlike footprints 212 million years ago. Melchor/NatureSome prints also bear the imprint of a small, rear-facing toe called a hallux.
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