Giant Banded Lizard (CR 7)

Huge Animal
Alignment: Always neutral
Initiative: +0; Senses: low-light vision, scent, Listen +7, and Spot +4

AC: 13 (-2 size, +5 natural), touch 8, flat-footed 13
Hit Dice: 10d8+60 (105 hp)
Fort +13, Ref +3, Will +3
Speed: 20 ft., climb 10 ft., swim 10 ft.
Space: 15 ft./10 ft.
Base Attack +7; Grapple +24
Attack: Bite +14 melee
Full Attack: Bite +14 melee and 2 claws +9 melee
Damage: Bite 2d8+9, claw 2d6+4 plus poison
Special Attacks/Actions: Improved grab, poison
Abilities: Str 28, Dex 10, Con 23, Int 2, Wis 10, Cha 5
Special Qualities:
Feats: Alertness; Cleave; Improved Overrun; Power Attack
Skills: Climb +12, Listen +7, and Spot +4
Advancement: 11-14 HD (Huge); 15-30 HD (Gargantuan)
Climate/Terrain: Warm deserts
Organization: Solitary
Treasure/Possessions: None

Source: Sandstorm

Improved Grab (Ex): To use this ability, a giant banded lizard must hit a creature of any size with its bite attack it can then attempt to start a grapple as a free action without provoking attacks of opportunity. If it wins the grapple check, it establishes a hold and attempts to deal bite damage each round thereafter.

Poison (Ex): Injury, Fortitude DC 21, initial and secondary damage 2d4 Str. The save DC is Constitution-based.

A giant banded lizard attacks any creature its own size or smaller without hesitation. As it holds a creature fast in its mouth, a giant banded lizard pumps the creature full of venom secreted from its lower jaw.