The single most and least successful species on San Lucas was based on Earth’s extinct sabertooth cats. The Albion engineered them up to the size of a draft horse, with the muscle and bone mass to support it, and a thick hide capable of deflecting any conceivable small arms fire. The stated goal of that first project was a biological tank. They were completely successful on that point. It was the attempt to graft human-level sentience into the new race that failed spectacularly. They have the brain mass necessary for hyper-intelligence, but we can’t see evidence that they use it. They are aggressive, combative, and dangerous as hell, but they lack anything like language or culture as seen in the other cats. They just don’t seem sentient, even though they should be.