Behemoth.

About Behemoth

Behemoth the Cat is a character from the novel The Master and Margarita by the Russian writer Mikhail Bulgakov. He is an enormous demonic black cat who speaks, walks on two legs, and can even transform to human shape for brief periods. He has a penchant for chess, vodka, pistols, and obnoxious sarcasm. He is evidently the least-respected member of Woland's entourage; Margarita boldly takes to slapping Behemoth on the head after one of his many ill-timed jokes, without fear of retribution. He is known for his jokes, which he never stops telling. The Russian word begemot also means hippopotamus; however, his name refers to the legendary Biblical monster.