Yeah, that should suffice. I do agree that it should be a Su ability, in retrospect.
Dead/unconscious supernatural brain eating sounds fine by me.
I like the idea of adding superior low-light vision, and I'd be fine with bumping the bite up to 2d6. I also don't mind slightly higher racial bonuses on Listen and Spot.
That looks alright. I kinda prefer +6 to Listen and Spot rather than +8 though.
Should we give 'em scent, too?
Definitely. Indeed, I assumed it already had scent. Perhaps with a +4 racial bonus to Tracking, like a wolf?
Skills: 16
Listen and Spot, of course. Survival (if we give 'em Track)?
Don't forget Hide! It says it may use ambush, but doesn't much care for it, so may not be that good at it. May have a lowish racial bonus in that, say +4 in dark jungles.
4 ranks Hide, 5 ranks Listen, 5 ranks Spot, 2 ranks Survival?
Feats: 2
Multiattack? Power Attack? Track (assuming we give 'em scent)?
I'd be tempted to make Tracking a bonus feat, like the SRD Wolf or Wolverine.
I imagine these things are all about the biting, so I was thinking Weapon Focus (bite) rather than Multiattack.
Power Attack would work as the other feat, but is a bit conventional.
Hmm, these things talk and "it often harasses larger monsters simply for the pleasure of seeing their frustration". Are there any skills or feats that would help it torment its rivals and victims?
Maybe up its Charisma to 12, give it the Persuasive feat and transfer a couple of skill points from Spot & Listen to give Bluff and Intimidate, just to make it a bit different?
So, put that together and my proposals are:
Skills: Bluff +5, Hide +1* [+5 in dark jungles], Intimidate +5, Listen +10, Spot +10, Survival +3* [+7 track by scent]
Feats: Persuasive, Track (B), Weapon Focus (bite)
Cha 12, 2 ranks Bluff, 4 ranks Hide, 2 ranks Intimidate, 3 ranks Listen, 3 ranks Spot, 2 ranks Survival, +4 racial Hide-in-jungle, +6 racial Spot & Listen, +4 racial track-by-scent.
What do you think?