Bizarre theropods, the racy Arsartis is the principal hunter of the mountain Bifurcatops herds. In a reversal of evolutionary trends, Arsartis has returned to a four-legged gait, like with many non-dinosaurian dinosauromorphs, for greater stability as it hurls itself along the treacherous terrain of the crumbling uplands in pursuit of prey. A solitary killer, it will use cover to get as close to prey as possible before initiating a chase, and then run it down with superior speed and maneuverability. Kills are made catlike, pinning the prey animal down with its foreclaws while delivering a lethal bite.
- Arsartis has killing-claws on its feet much like dromaeosaurs.