Size/Type: Tiny Animal
Hit Dice: ¼ d8 (1 hp)
Speed: 15 ft. (3 squares), climb 15 ft., swim 15 ft.
Armor Class: 14 (+2 size, +2 Dex), touch 14, flat-footed 12
Base Attack/Grapple: +0/-12
Attack: Bite +4 melee (1d3-4)
Full Attack: Bite +4 melee (1d3-4)
Space/Reach: 2½ ft./0 ft.
Special Attacks: —
Special Qualities: Low-light vision, scent
Saves: Fort +2, Ref +4, Will +1
Abilities: Str 2, Dex 15, Con 10, Int 2, Wis 12, Cha 2
Skills: Balance +10, Climb +12, Hide +16, Move Silently +10, Swim +10
Feats: Stealthy, Weapon FinesseB
Organization: Plague (10-100)
Challenge Rating: 1/8
Level Adjustment: —
These omnivorous rodents thrive almost anywhere.
Rats usually run away. They bite only as a last resort.
Rats have a +4 racial bonus on Hide and Move Silently checks, and a +8 racial bonus on Balance, Climb, and Swim checks. A rat can always choose to take 10 on Climb checks, even if rushed or threatened. A rat uses its Dexterity modifier instead of its Strength modifier for Climb and Swim checks. A rat 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.
Source: Monster Manual 1