According to a website, the 10 most dangerous animals (to humans) are:
No.10 Bear; No.9 Shark; No.8 Jelly fish; No.7 Hippo; No.6 Elephant; No.5 Crocodile; No.4 Lion; No.3 Scorpion; No.2 Snakes; and No.1... tiny Mosquitoes! Mosquitoes weigh in at only 2.5mg but kill an estimated 2-3 million people a year!
Top 10 Most dangerous animals in the world...
But when we compare fights between animals, though size matters, 3 lions could easily kill a big hippopotamus...