Chimeraspawn (CR 8)

Large Magical Beast
Alignment: Usually chaotic evil
Initiative: +1 (Dex); Senses: darkvision 60 ft., low-light vision, Listen +9, and Spot +9

AC: 18 (-1 size, +9 natural), touch 9, flat-footed 19
Hit Dice: 10d10+30 (81 hp)
Fort +9, Ref +7, Will +4
Speed: 30 ft., fly 50 ft. (poor)
Space: 10 ft./5 ft.
Base Attack +9; Grapple +17
Attack: Bite +12 melee
Full Attack: Bite +12 melee and bite +12 melee and 2 claws +10 melee
Damage: Bite 2d6+4, bite 1d6+2, claw 1d6+2
Special Attacks/Actions: Breath weapon - fire (3d8 damage) and lightning (3d8 damage)
Abilities: Str 19, Dex 10, Con 17, Int 4, Wis 13, Cha 10
Special Qualities:
Feats: Alertness, Hover, Iron Will, Multiattack
Skills: Hide +1*, Listen +9, and Spot +9
Advancement: -
Climate/Terrain: Temperate Hills
Organization: Solitary
Treasure/Possessions: Standard

Source: Converted

A deadly foe, the chimeraspawn prefers to surprise prey. It often swoops down from the sky or lies concealed until it charges. Both of the dragon heads can loose a breath weapon instead of biting - one head using fire breath (3d8 Reflex half DC 17) and the other having a line of lightning (3d8 Reflex half DC 17).

Skills: The chimera's three heads give it a +2 racial bonus to Spot and Listen checks.