The Arboreal Dinosaur is a behaviourally and almost physically ape-like dinosaur from the Cretaceous. They are seen in Series 4 and Series 5. One was shot back to the anomaly and another one got out and it fell off the building and died. In Primeval Series 5, an Arboreal Raptor came out of the anomaly, but James Lester shot it and the Arboreal Raptor was either stunned or dead.

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