Rabid Grizzly
Diseased White Bear

A staple for undead hunters seeking a tanking pet, the Diseased White Bear has a little bit of interesting history behind it.
The first tamable mob of these gnarled looking bears can be found in Dragonblight, the level range between 71-72. Common enough if you do the quests around the area.
It's the Tirisfal Bear of Tirisfal Glades that is a really bizarre specimen. While not a rare, it has a long respawn timer, and it's level range is between 80-84. Keep in mind, Tirisfal Glades is basically the starting zone for the Forsaken. As I am only level 71 I decided to log on my rogue and do some investigating and what I found was mind = blown.
Along the walk path of this bear (level 81 at the time before I killed and skinned him) there was a ring of mushrooms surrounded by...Faerie Dragons? Level 81...Fey-Drunk Darters to be exact. What happens next has to be seen to be believed.

The Darters take up position around the mushroom circle and the music changes, it is heard nowhere else in Azeroth as they bathe the circle in light and musical notes and the corrupted deer nearby stand and watch. After some poking around I discovered this event event happens every 6 hours; so if you're out taming the Tirisfal Bear; make sure to stop by here and you may be in for a treat.
Thus far, no rhyme or reason in-game has been given for this event; making it even more special. Screenshots do this no justice, so instead have a video!
http://www.youtube.com/watch?v=cPQXpOHwWag
The Tame: Back to the bear, the Diseased White version was a hell of an easy catch. No trap needed, just ran up and woo'd the big bastard. Seriously, after the Faerie Dragon event everything was sort of muted for awhile. Basically, any hunter of level can grab this bear with no troubles (even with the many mobs patrolling the zone). This particular one I tamed was named Scarhide (for obvious reasons).
Skin, Sounds, Etc: By the time you are level 71, if you wanted a ragged looking bear you probably already managed to get a lower level one from areas like Western Plaguelands. Really, there's not too much variation between the diseased skins in terms of color. Sounds are shared with all bears' quiet while idle but can be quite noisy with constant growls in combat.

Use: The Rabid Grizzly is a Tenacity pet, meaning he's great for solo questing. Make no mistake though, his special attack has use in both instances and PvP. Demoralizing Roar reduces physical damage caused by all enemies within 8 yards by 10% for 15 sec. This means in raids your tank is taking less damage and in PvP you are taking less damage.
Bears are also one of the few families of pets that have a bonus ability, this one being Rest. Before Pet happiness was nerfed, it would cause your bear to drift into a slumber for a few moments and restore some happiness...now it just...takes a nap? Yeah, that's about it.

Final Word: Another successful adventure, this one with a pleasant surprise. Too bad I really have no use for Scarhide at this time and he will be released back into the wilds; maybe with the strange little Faerie Dragons.
Ready for a 4th run, hook it up!
Name: Ocyen (Dwarf)
Level: 71
Exotics: Yup, have BM as off spec as well.
Restrictions: No damn dirty poop flinging monkeys. Apes, they are ok.
My Stable (Not Just Rares): Oozeworm (Grubfist), Whooly Rhino Bull (Rhinox), Kurmokk (Kurmokk), Silithid Ravager (Stitch), Greater Lava Spider (Goo), Tyrant Devilsaur (Gore), Ghamoo-ra (Haggis) Tsul'Kalu (Mekanikongu), Diseased Hawk (Morgue), Pogeyan (Pogeyan), Golden Eagle (Razorbeak), Quillfang Ravager (Rahzar), Humar the Pridelord (Yang), Sian-Rotam (Yin).
Challenges Completed: Pogeyan, Orange Turtle, Diseased White Bear