Dire wolverines grow to about 12 feet in length and can weigh as much as 2,000 pounds.

Dire wolverines attack opponents wantonly, fearing no other creatures.
Rage (Ex): A dire wolverine that takes damage in combat flies into a berserk rage on its next turn, clawing and biting madly until either it or its opponent is dead. An enraged dire wolverine gains +4 Strength, +4 Consitution, and ?2 AC. The creature cannot end its rage voluntarily.
Skills: A dire wolverine has a +8 racial bonus on Climb checks and can always choose to take 10 on Climb checks, even if rushed or threatened.
SEE WIKIPEDIA ENTRY: Wolverine

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System Reference Document -> List of Creatures (SRD)