Elephant diarrhea > Hippo diarrhea > Tiger diarrhea However, when discussing animals in general, I think the deadliest animal is the brain parasite inside Lucius's mind waiting to feast upon all of our brains to make us relive Lucius's greatest fears, which are no doubt infinitesimally greater than all of the world's population's fears combined a thousand times over. It is larger than this universe can ever expand. All we can do is sit here and wait for the world to end while discussing inappropriate animu things and stuff about what animal is the greatest (white Bengal tiger kitties).