n huge animal dinosaur 

Perception +12; low-light vision, scent (imprecise) 30 feet

Skills Athletics +17

Str +7 Dex +0 Con +4 Int -4 Wis +2 Cha -1

AC  26; Fort +16, Ref +10, Will +12

HP 90

Speed 25 feet

Melee [>] tail +17 (backswing, reach 15 feet), Damage 2d8+7 bludgeoning plus punishing tail

Melee [>] foot +17 (reach 10 feet), Damage 2d6+7 bludgeoning

Punishing Tail A creature struck by the ankylosaurus's tail must attempt a DC 24 Fortitude save. On a failure, it's slowed 1 until the end of its next turn; on a critical failure, it's stunned until the end of its next turn.

Trample [>>>] Medium or smaller, foot, DC 24

Bestiary, page 97.