Wolpertinger

Wolpertingers are small hare-like critters who have the head, body, feet, and tail of a hare with bird wings, antlers, and fangs. They only appear during Brewfest, as they are attracted to the scents of the festival, and can only be seen by drunk characters. Many a drunken Brewfest goer has told the tale of this mysterious creature, but few remember that tale in the morning.

A drunk hunter can track them using beast tracking.

As a companion pet

 * Wolpertinger's Tankard is available during Brewfest. On US servers, it's a quest reward from Catch the Wild Wolpertinger!, while on EU servers it can be purchased from various vendors at a cost of.

Trivia
The is a creature from Bavarian folklore, said to have head of a rabbit, the body of a squirrel, the antlers of a deer, and the wings and occasionally the legs of a pheasant. It is reminiscent of the in the US and the  in Sweden.