Yangchuanosaurus is a large metriacanthosaurid theropod. They have a pair of powerful, three-fingered arms and a short, puglike snout that provides a powerful bite. They can grow up to 36 feet long and weigh 3.6 tons. They aren't territorial, but they are solitary. Females may brawl over nest sites. Like most theropods, they are fast-running bipedal predators.