Which animal is the most dangerous: African elephant, Bengal tiger, lion, crocodile, or grizzly bear?

The crocodile is the most dangerous of those animals, uming you mean the one most likely to kill you. Elephants are a close second. Tigers, lions and grizzly bears all kill far fewer people than either crocs or elephants, but of the three grizzlies attack people the most often. Tigers become man-eaters more often than lions.