| DM_Blake |
Pathfinder SRD, Combat Maneuvers, Performing a Combat Maneuver wrote:
Unless otherwise noted, performing a combat maneuver provokes an attack of opportunity from the target of the maneuver.
It is also worth noting that all 6 Combat Maneuvers have this line in their first paragraph: "If you do not have the Improved Trip feat, or a similar ability, initiating a trip provokes an attack of opportunity from the target of your maneuver."
(Obviously the name of the feat changes with each maneuver)