-4 Strength +2Dexterity +2 Intelligence: Physically tiny and weak Rats are nimble in body and mind.
Diminutive: Rats are diminutive creatures and gain a +4 size bonus to their Armor Class, a +4 size bonus on attack rolls, a -4 penalty to their Combat Maneuver Bonus and Combat Maneuver Defense, and a +12 size bonus on stealth checks.
Continuous Movement: Rats have a base speed of 20 feet which does not diminish when climbing or swimming.
Low-Light Vision: Rats can see twice as far as humans in dim lighting. see Chapter 7 Pages 172-173 (Pathfinder Core Rule Book).
Keen Senses: Rats receive a +2 racial bonus on Perception checks.
Scent: Rats have the Scent ability.
Spell Resistance: Rats receive a resistance to spells of 6+class levels.
Sure-Footed: Rats receive a +2 racial bonus on Acrobatics and Climb skill checks.
Languages: Rats begin play knowing Common. Rats with high Intelligence scores can choose from any language.