Currently, this is a small tallstrider, the size of 멀고어 새끼 타조 but with the color scheme of 날쌘 숲타조. It is slated to be available from 라흐라, the Darkmoon pets vendor for 90 Darkmoon Prize Tickets.
I have an odd obsession with anything in WoW that resembles a plainstrider, so I can't wait to add this little guy to my collection. I currently have the Mulgore Hatchling (named Dino), the Swift Forest Strider, the Swift Springstrider, and the Swift Lovebird mounts.
Edit: two hotfixes are now implemented. First one made all newly-learned Darkmoon Hatchlings rare. Second one, already in effect, also converted the hatchlings previously learned to Rare quality. All Darkmoon Hatchlings, including those added to journal prior to hotfix, are now rare.
Outdated: Unlike the other 6 pets bought with 90 Darkmoon Prize Tickets (Balloon, Cub, Monkey, Tonk, Turtle, Zeppelin), which are all rare quality, this one is Uncommon when learned. Can be fixed with battle-stone, of course, but it might be good to know before buying it is not of the same quality as other 6 pets.
Animations are the standard Strider animations - scratches itselfs, squawks, chirps when clicked.
The previously bought Darkmoon Hatchings which were uncommon have now been hotfixed (13 Dec 2012) to rare quality so save your battle-stones for other pets.
This is actually a critter pet, not a flying one (as I had assumed since it's a bird).
I actually just received one of these as a prize, along with a ticket, for completing one of the daily quests. This is also the first time I've done these quests on this toon.
If you're like me, and like having matching pets, companions, and mounts - there is a tamable mob that has this skin. There are a few rare ones, but the one that is always up is http://www.wowhead.com/npc=22807#comments, found in outland in Terrokar forrest.
This pet is quite special, in that is a Critter with the ability to deal considerable Flying damage. This sets it as a hard counter to Aquatic with Elemental abilities - which are also a very narrow demographic. Penguins, for the most part!
So, if someone is annoying you with Penguins (or Doopy is being particularly annoying) this little guy is the guy.