Tangle Prey◆ The dromaar draws a bola and Strikes a target within 20 feet. On a success, the dromaar immediately rolls an Athletics check against the target's Fortitude DC to Trip them.
Source: Pathfinder Monster Core
Running this fight? Add the dromaar mountaineer to the initiative tracker: type its name and the AC, hit points and Perception for initiative fill in, and the book button shows this stat block mid-fight.