The Dimetrodon is a dinosaur with a fin that only appears in The Land Before Time.


Dimetrodon only appears in the original Land Before Time, when Littlefoot, Ducky, and Petrie hide from one crossing their path. As the Dimetrodon passes it flicks out its tongue like a snake and a monitor lizard and hisses.


  • Although portrayed as a dinosaur living during the late Cretaceous period, Dimetrodon is actually a synapsid that lived during the Permian Period and is a common ancestor of both mammals and dinosaurs.
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