Snake Body: -1 Speed, +2 Stealth
Rattle Tail: +1 Distasteful Noise (since it's not a voice persay)
Big Eyes: +3 Sight
Tetrachromat: +4 Sight
Farsighted: +5 Sight, blind to nearby tiles
Night Eyes: Avoid enemies at night
Spider Body: Web attack (Prevents movement for a turn)
Spider Legs: Wall climbing (treat upwards hexes as two hexes )
Inner Jaw: +2 Strength, +1 Fishing (No, not just the xenomorphs from Alien: moray eels actually have this)
Light Body: +1 Speed, +2 Flight to winged creatures
Herbivore Head: Bonus to finding edible plants
Carnivore Head: Bonus to finding edible animals
Pistol Claw: Ranged-only attack at +2 Strength (Pistol shrimp are weird and scary.)