I honestly perfer these guys over rexes for a few reasons. More speed, pack damage, plus they are alot easier to mate. They can actually have about the same amount of health, (Maybe just a bit less, but it's really close). When you ride the alpha and use it's roar,the damage is insane. One allosaurus would (Probably) lose against one rex, but a pack of the same amount of allosaurus verses the same amount of rexes would win if you build health and attack. I also perfer these over carnos because one yut.. (Hairy T Rex, can't remember the name), would probably destroy your whole carno pack.

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