What are the top five most dangerous bears?

Sources differ on what the top five most dangerous predators are. Any internet search will bring up a variety of lists.

Epoch Times lists them as:

1. mosquito
2. carpet viper
3. African lion
4. crocodile
5. elephant

List25 states the following:

1. Mosquito
2. African elephant
3. Saltwater crocodile
4. hippopotamus
5. blue-ringed octopus