JWD ALLO AND CARNO

Allosaurus (meaning "different lizard") was the most common predator of the Late Jurassic period and among the most dangerous. Like most theropod dinosaurs, its jaws were filled with serrated teeth shaped like blades. Computer studies suggest that Allosaurus attacked by using its upper jaw like a machete to hack at its victim, then it used its lower jaw to bite out a slice of meat, although recent studies have proven this unlikely. In terms of size, it was the third-largest theropod of its era, only the likes of the megalosaurid Torvosaurus (10-11 meters or 33-36 feet with 4-5 tons of weight behind it) and Saurophaganax (12-13 meters or 39-43 feet with 6 tons of weight behind it) exceeded it in size and weight. It averaged around 8.5 meters long (28 feet) and around 3 meters (10 feet) tall. However fragmentary remains suggest larger lengths of 11 to 12 meters (36-39 feet), though its weight would be less than the Saurophaganax, which was the heavyweight theropod of the Jurassic.

Carnotaurus ("meat-eating bull"), was one of the most bizarre yet dangerous meat-eating dinosaurs ever found. Its skull was short, with spiked armor in the form of feature scales across its body (skin impressions show this, although it is unknown around the face since the impressions for that area were destroyed) on the top and a pair of knobby horns over its small eyes. The neck and shoulder blades were well developed, but the arms were incredibly short, with forearms so shrunken they were practically just wrists; not even Tyrannosaurus rex had such small arms.[1]