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If I put an Ankylosaurus with a Brontosaurus do they both rampage. No fence so Brontosaurus is fine and Ankylosaurus is fine with another dinosaur but no fence?

They would rampage in most circumstances. The Ankylosaurus can share a PEN. If placed outside a pen its trait does nothing. Technically, if the bronto was placed inside a pen the Ankylosaurus wouldn't rampage immediately but the Bronto would since it requires being in Open Space, and if the bronto broke the fence, THEN the Ankylosaurus would also rampage. In any case, you have a 1/6 chance of it NOT ending terribly.