"Carnotaurus" was a lightly built, bipedal predator, in length and at least in weight. As a theropod, "Carnotaurus" was highly specialized and distinctive. It had thick horns above the eyes, a feature not seen in other carnivorous dinosaurs, and a very deep skull sitting on a muscular neck. Also, it had small, vestigial forelimbs, smaller even than those of "Tyrannosaurus". 