We've borrowed this before...
Gliding: A hadozee can use its wings to glide, negating any damage from a fall of any height and allowing travel 20 feet horizontally for every 5 feet of descent. A hadozee glides at a speed of 40 feet (poor maneuverability).
The harrier has 3 more Hit Dice, but does less damage with its claws. So it presumably has slightly lower Str (2 less than scathe?). Con is probably the same, as both have the same "bonus hit points" as their HD. The harrier's AC is also one worse. I'd recommend less natural armor rather than lowering Dex.
Thus: Str 13, Dex 14, Con 18, Int 6, Wis 11, Cha 7, +2 natural?
The camo abilitiy is this: "When motionless and against a background of green jungle foliage, harriers blend in well. In this case, opponents receive a -2 penalty to surprise rolls." I'd just give them a racial bonus to Hide in foliage or whatever.
Thoughts on poison?
Fair enough on everything. Agreed.