Mandrillus1
The head of a mandrill tops this horrific admixture of primate and equine features giving this beast a feral, degenerate quality.

Mandrillus (CR 4; XP 1,200)
CN Medium aberration (ruined)
Init +2; Senses darkvision 60 ft.; Perception +7
Defense
AC 18, touch 13, flat-footed 15
(+2 Dex, +1 dodge, +5 natural)
hp 37 (5d8+15)
Fort +4, Ref +3, Will +6
Defensive Abilities chimeric, madness (W-DC 12); Immune disease, poison, polymorph
Offense
Speed 30 ft., climb 30 ft.
Melee bite +7 (1d6+4), 1d6 tail slaps +2 (1d4+2) against single target
Ranged thrown object +5 (1d6+4)
Space 5 ft.; Reach 5 ft.
Special Attacks lashing tails, repulsive display
Statistics
Str 18, Dex 15, Con 17, Int 8, Wis 14, Cha 13
Base Atk +3; CMB +7; CMD 19
Feats Dodge, Pack Attack, Throw Anything
Skills Acrobatics +12, Climb +16, Escape Artist +7, Intimidate +5, Perception +7; Racial Modifiers +2 Acrobatics, +4 Climb
Languages Common (can’t speak)
Ecology
Environment tropical hills, forests or jungles
Organization solitary, pair, or horde (3-12)
Treasure incidental
Special Abilities
Chimeric (Su) The mutated cells of the mandrillus’ body are highly adaptable, changing to protect it from harsh conditions. Once a mandrillus has taken energy damage, it gains energy resistance 5 against that energy type for 24 hours. A mandrillus may gain multiple resistances in this manner.
Lashing Tails (Ex) As a standard action or part of a full attack a mandrillus can attack a single target with its thin, whip-like tails. This grants the mandrillus 1d6 tail slap attacks against that target.
Madness (Su) Mandrillus are immune to all mind-affecting effects but if they are targeted by such an effect must make a Will save or suffer the effects of lesser confusion (DC 12).
Repulsive Display (Ex) As a standard action a mandrillus may present his inflamed hind-quarters and thrashing tails in an instinctual mating ritual. Any non-mandrillus creature within 30 feet is both repulsed and yet strangely fascinated by this display and is stunned for 1 round and then sickened for 1d4 rounds unless they can look away. A DC 13 Will save negates the effect. A mandrillus can perform this display once per day. The save DC is Charisma-based.

Mandrillus are an amalgam of a male mandrill and a jackass. Even though all mandrillus appear to be male, they live in large groups called hordes, similar to normal mandrills. They are both highly aggressive and territorial leading them to attack almost any creature they find violating their territory. A single horde will claim an extremely large area as its territory and then live in a nomadic fashion roaming between various sites within the area. They will rarely spend the night in the same area twice in a row.

Rumors persist of mandrillus hordes stealing or capturing female horses, donkeys and other equine creatures for breeding purposes. Indeed it would provide an explanation of how an apparently all male population is able to reproduce. Given the chimeric nature of the mandrillus, unions with centaurs, hippogriffs, pegasus or other exotic equine creatures could easily produce mutant or hybrid offspring.