Woodling Monitor Lizard (CR 4)

Medium Animal
Alignment: Always neutral
Initiative: +2 (Dex); Senses: low-light vision, Spot +4, and listen +4

AC: 22 (+2 Dex, +10 natural), touch 12, flat-footed 20
Hit Dice: 3d8+9 (22 hp); DR: 5/slashing
Fort +8, Ref +5, Will +2
Speed: 30 ft., swim 30 ft.
Space: 5 ft./5 ft.
Base Attack +2; Grapple +5
Attack: Bite +5 melee or slam +5 melee
Full Attack: Bite +5 melee or slam +5 melee
Damage: Bite 1d8+4, slam 1d6+4
Special Attacks/Actions: Spell-like abilities
Abilities: Str 17, Dex 15, Con 17, Int 1, Wis 12, Cha 2
Special Qualities: plant traits, vulnerability to fire
Feats: Alertness; Great Fortitude
Skills: Climb +7, Hide +0, Move Silently +6*, Spot +4, Swim +11, and listen +4
Advancement: 4-5 HD (Medium)
Climate/Terrain: Warm forests
Organization: Solitary
Treasure/Possessions: None

Source: Monster Manual III

Woodling monitor lizards can be aggressive, using their powerful jaws to tear at prey or enemies. They will also attack anyone that threatens their habitat.

Spell-Like Abilities: 1/day - entangle (DC 7), summon nature's ally II.

Skills: A woodling monitor lizard has a +8 racial bonus on any Swim check to perform some special action or avoid a hazard. It can always choose to take 10 on a Swim check, even if distracted or endangered. It can use the run action while swimming, provided it swims in a straight line.

Monitor lizards have a +4 racial bonus on Hide checks and Move Silently checks. *In aboveground natural areas, the Hide bonus improves to +12 and the Move Silently bonus improves to +8.