Paleontologists have just identified the world's oldest known dinosaur embryos, according to a paper in the current Journal of Vertebrate Paleontology.
The embryos, found in their still well-preserved eggs, date to the early Jurassic Period 190 million years ago. The researchers say they are the oldest known embryos for any land-dwelling vertebrate.
They belong to Massospondylus, a member of a group of dinosaurs called prosauropods that were ancestors to the giant, plant-eating sauropods. Sauropods are the iconic four-legged dinosaurs known for their long necks and long tails.
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