what is the most dangerous animal you think you could defeat?

you can only use what is around you, rocks, vines, the ol sand in the eyes gag.

btw im going with hippo, they kill more than you realize

what if i took to the trees! jump on its back shapr stick right in the base of its skull, where it meets the spine. if i fail...i roll off and regroup, they may run fast, but they cant exactly turn on a dime

hmmmm...i could sneak up on it when its docile, it would think the up to kill mode would be longer and less agile as a cat or dog based mammal, 30 pound rock would rattle its skull