Track mystery 5

Answer: The track on the left was made by a small theropod dinosaur; this type of track has been named Wildeichnus. The tracks on the right are called Ameghinichnus, and some scientists think they were made by an early mammal or mammal-like animal, though it is unclear exactly what kind.

Artist's reconstruction of Gobiconodon, an early mammal that lived during the Jurassic Period. The animal that made Ameghninichnus may have been similar. Image by Pavel Riha (CC BY SA 3.0).

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