n large animal 

Perception +7; darkvision, tremorsense (imprecise) 60 feet

Skills Acrobatics +6, Athletics +11, Stealth +8

Str +4 Dex +1 Con +3 Int -4 Wis +0 Cha -2

AC  20; Fort +12, Ref +8, Will +7

HP 40

Speed 25 feet, burrow 20 feet

Melee [>] mandibles +13 (acid), Damage 1d8+4 piercing plus 1d6 acid

Ranged [>] acid spit +10 (acid, range 30 feet), Damage 3d6 acid

Armor-Rending Bite [>>] The ankhrav makes a mandibles Strike; if the Strike hits, the target's armor takes the damage and the acid damage bypasses the armor's Hardness.

Spray Acid [>>] (acid) Frequency once per hour; Effect The ankhrav spews acid in a 30-foot cone, dealing 3d6 acid damage and 1d6 persistent acid damage (DC 20 basic Reflex save).

Bestiary, page 22.