Otyugh MM1: +10 Stealth bonus in swampy environs while immobile. Immune to disease. Stealth Skill: +8. Tentacle: Reach 3, 1d8+6 damage, pull 2, grabbed (until escape). Bite: 1d10+6 damage, expose to filth fever
Otyugh MV: Stealth Skill: +13. Tentacle: Melee 3, 2d8+6 damage, pull 2, grabbed (DC 16 escape). Bite: 1d10+8 damage or 1d10+12 vs. grabbed creature; exposure to lesser otyugh filth fever.
They are otherwise identical.