I understand your ferocity as aggressiveness, then the ranking is as follows: lions, wolves, rhinoceros, tigers, elephants, black bears, cheetahs, the ferocity of the animals and their food, strength, social organization, etc., generally meat-eating is more aggressive, such as tigers is the classic beast of prey; the strength of the strong and short-tempered also have aggression, such as rhinoceros, rhinos in the protected area often occurs rhinoceros knocked over the tourist buses The rhinoceros will even bump into elephants because of their poor eyesight and suspicion; wolves, although the single combatant is low, but because of group action, so often attack large animals, and therefore fearless; the same is a group of animals, the lion single combatant is higher than the wolf, so higher than the wolf; elephants single combatant is the strongest, but also pitched old group action. Fortunately, it is not a carnivore, but there is no guarantee that one day it is in a bad mood will do something, in fact, there are a lot of such instances, and usually lonely elephants do it, the reason is that their family was slaughtered by poachers, so they grew up to bury the hatred, and grew up to become a dangerous beast, endangering the safety of mankind; black bears you don't go to mess with it it has to avoid you, talk about ferocious; cheetahs are the most pitted, capturing the The cheetah is the most helpless, the food is often plundered by other carnivores without resistance, so the bottom of the ranking. It is recommended to watch more "man and nature" this kind of program, healing the soul but also to increase the knowledge.