Each monster symbolizes its own sin. The three monsters are described when Dante says: I faced a spotted Leopard, all tremor and flow/ and gaudy pelt. And it would not pass, but stood so blocking my every turn that time and again
I was on the verge of turning back to the wood./ This fell at the first widening of the dawn As the sun was climbing Aries with those stars
That rode with him to light the new