The Questing Beast is also known as the Glatisant. It has the head of a snake, body fo leopard, hindquarters of a lion and feet of a hart. It makes a sound like 80 hounds hunting. A woman who slees with her brother gives birth to this and is later torn apart by dogs. The pursuit of this creature belonged to Sir Pellinore.
Sources. (1) and (2)


This is the questing beast along with king arthur.(3)

Sources
(1) Le Morte D'Arthur
(2) The Element Encyclopedia of Magical Creatures
(3) http://www.answers.com/topic/questing-beast