This hideous creature has the head of a leering old woman growing from the body of a great furry bat. Its legs are tipped with sharp claws and a long tongue whips from between its slavering jaws. Its wings have a razor-sharp edge, stained brown with dried blood.
Taken from Creature Codex
Wakwaks are horrific vampiric beasts native to jungles. Unlike many such blood-drinkers, wakwaks are vicious fighters and are as likely to outright kill a victim as they are to leave them drained but alive. Although wakwaks can suck the blood from victims delicately, they are every bit as eager to lick up the leavings of a gore-soaked corpse. Their favorite food is a still-beating humanoid heart, and such victuals give these creatures an unnatural vitality.
Male wakwaks do exist, although they are very rare; about ten females exist for every male. Mating rights are the subject of brutal fights between females that often leave multiple wakwaks dead. Wakwaks are poor parents, leaving their children on their own shortly after birth. Even baby wakwaks have shapeshifting powers, however, and juveniles typically live out their lives disguised as bats until they are strong enough to tackle large prey.
A wakwak stands about three feet tall and weighs 40 pounds. Their wingspan stretches out to ten feet. They are clumsy on the ground, scrabbling on their wings and feet like a bat, but are very maneuverable in the air. Nocturnal, they typically sleep in high trees during the day while transformed into a bat.
Wakwak CR 5
CE Medium magical beast
Init +4; Senses darkvision 60 ft., Perception +6, scent
AC 17, touch 15, flat-footed 12 (+4 Dex, +1 dodge, +2 natural)
hp 51 (6d10+18)
Fort +8, Ref +9, Will +3; evasion
Speed 20 ft., fly 40 ft. (good)
Melee bite +8 (1d4+2 plus grab), 2 claws +8 (1d6+2), 2 wings +6 (1d6+1 plus bleed)
Special Attacks bleed (1d6),blood drain (1d3 Con), eat heart, grab
Str 15, Dex 18, Con 16, Int 7, Wis13, Cha 14
Base Atk +6; CMB +8 (+12 grapple); CMD 23
Feats Dodge,Hover, Multiattack
Skills Fly +12, Perception +6, Stealth +9
SQ change shape (fruit bat (as hawk) or dire bat, beast shape II),soundwarp
Environment warm forests
Organization solitary, pair or flock (3-6)
Eat Heart (Su) A wakwak can eat the heart of a foe that it slays with a coup de grace effect. If it does so, it gains the benefits of a false life spell (CL 6th) and gains a +2 enhancement bonus to Strength and Dexterity that lasts for 10 minutes.
Soundwarp (Su) The distance penalties for Perception checks used to detect a wakwak are reversed within 100 feet. Thus, a creature 100 feet away from a wakwak may make Perception checks against it at no penalty, but a creature 10 feet or closer to a wakwak take a -10 penalty on their Perception checks.