Track mystery 1

Answer: The track is called Grallator, and was made by a theropod dinosaur. Theropods are a group of mostly carnivorous bipedal dinosaurs that includes modern birds. The theropods that made Grallator tracks were relatively small dinosaurs, but they were not birds. Grallator is a very common fossil track in Triassic and Jurassic deposits in the United States.

Coelophysis reconstruction
Artist's reconstruction of Coelophysis, a theropod dinosaur from the Triassic. A dinosaur like Coelophysis probably left Grallator tracks. Image from the US National Park Service.

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