n medium animal 

Perception +8; low-light vision, scent (imprecise) 30 feet

Skills Athletics +8 (+10 to Climb)

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

AC  18; Fort +10, Ref +8, Will +6

HP 32

Passive Points A creature that hits a porcupine with an unarmed Strike or a non-reach melee Strike takes 1d8 piercing damage (basic Reflex save) On a critical failure, the creature also takes 1d4 persistent piercing damage as the quills hook into its flesh.

Speed 25 feet

Melee [>] quills +11, Damage 1d8+4 piercing plus embed quill

Melee [>] tail +11, Damage 1d6+4 bludgeoning

Embed Quill A creature damaged by the porcupine's quills Strike must succeed at a DC 18 Reflex save or some of the quills remain embedded in its body, dealing 1d4 persistent piercing damage.

Rearward Rush [>>] The porcupine scuttles backward, quills extended. It Strides twice, then makes a quill Strike. The target is flat-footed against this Strike unless it has seen a Rearward Rush before.

Bestiary 3, page 207.