Cockatrice

Cockatrices are apparently small chickens found on Azeroth, thus far only represented by the Pygmy Cockatrice.

Speculation
This may be the Darkmoon Faire's attempt at passing an ordinary chicken off as the more traditional mythical beast.

Cockatrices and blood elves
Cockatrice was also going to be the name for the blood elf racial mount, but due to the word's unfortunate coincidental similarity to a vulgar slang term, the name was changed to the Hawkstrider.

Between Blizzard's tendency to put their own spin on myths and traditional fantasy — and the high elven love of grace and beauty — it is no mystery why these scaly monsters were reinvented for their new incarnation.

Trivia
In classical representations, cockatrices look like a mixture of a rooster and a dragon or snake, as seen in the picture to the right.

Depending on which source is used, the cockatrice is sometimes another name for the basilisk. See Myth for more information.