Snake, Huge Viper (CR 3)

Huge Animal
Alignment: Always neutral
Initiative: +6 (+2 Dex, +4 Improved Initiative); Senses: scent, Listen +7, and Spot +7

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AC: 15 (-2 size, +2 Dex, +5 natural), touch 10, flat-footed 15
Hit Dice: 6d8+6 (33 hp)
Fort +6, Ref +7, Will +3

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Speed: 20 ft., climb 20 ft., swim 20 ft.
Space: 15 ft./10 ft.
Base Attack +4; Grapple +15
Attack: Bite +5 melee
Full Attack: Bite +5 melee
Damage: Bite 1d6+4 and poison
Special Attacks/Actions: Poison

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Abilities: Str 16, Dex 15, Con 13, Int 1, Wis 12, Cha 2
Special Qualities:
Feats: Improved Initiative; Run; Weapon Focus (bite)
Skills: +10, Balance, Climb +11, Hide +3, Listen +7, Spot +7, and Swim +11
Advancement: 7-18 HD (Huge)

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Climate/Terrain: Warm forest
Organization: Solitary
Treasure/Possessions: None

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Source: Monster Manual

Poison (Ex): Bite, Fortitude save (DC 13); initial and secondary damage 1d6 temporary Constitution.

Improved Initiative: +4 on Initiative checks