Squirrel Nutkin (from "The Squirrel and the scorched ones").
I used the Squirrel-stats from one of the Dragon magazines (thanks to Squirrel Nutkin for pointing it out to me!), and added the "Herald of Denev" template.
Squirrel Nutkin, Herald of Denev, the Earth Mother
CR --; Diminutive Outsider; HD d10; hp 12; Init +5 (Dex); Spd 15 ft., climb 22 ft.; AC 24 (+5 natural, +4 size, +5 Dex); Atk +2, Damage: d4-3, SQ: Scent, Aura of Denev, Blindsight, Damage Reduction 20/+2, Fast Healing 10, Immunities, Lowlight Vision, Resistance to Energy (10 against cold, electricity and fire), Spell like abilities, Spell Resistance 20, Tongue of the wild; Face 1 ft. by 1 ft.; Reach 0 ft.; SV Fort +4, Ref +7, Will +3; Str 4, Dex 20, Con 15, Int 10, Wis 16, Cha 20.
Skills: Animal Empathy: 13, Balance: 14, Climb: 14, Concentration: 12, Diplomacy: 10, Handle Animal 14, Heal: 13, Hide: 27, Intuit Direction: 13, Jump: 15, Knowledge Nature: 15, Listen: 8, Move Silently: 27, Scry: 5, Search: 5, Sense Motive: 8, Spellcraft: 5, Spot: 13, Swim: 5, Wilderness Lore: 18
Feats: Alertness, Combat Casting, Dodge, Endurance, Mobility, Multiattack, Run, Spring Attack, Track