Questing Beast

The Questing Beast, or the Beast Glatisant (Barking Beast), is a monster from Arthurian legend, the subject of quests by famous knights like King Pellinore, Sir Palamedes, and Sir Percival. The strange creature has the head and neck of a serpent, the body of a leopard, the haunches of a lion and the feet of a hart. Its name comes from the great noise it emits from its belly, a barking like "thirty couple hounds questing".
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[Arthurian] One day, when King Arthur stopped to rest by a spring, he was surprised by a sound like thirty baying hounds. A strange animal with a snakes head the body of a leopard the back legs of a lion and the hooves of a deer burst through the underbrush, pursued by king Pellinore. Pellinore had hunted the Questing Beast, as the creature was called, all his life but never managed to capture it. Malory describes it as "the strongeste beste that ever he [Arthur] saw or herde of."