Effect The hadrosaurid Strides twice. It has a +20-foot circumstance bonus to its Speed during these Strides.
Trample◆◆◆ Large or smaller, foot, DC 21 basic Reflex
Source: Pathfinder Monster Core
Running this fight? Add the hadrosaurid 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.