Some sources estimate that mosquitoes are responsible for the most human fatalities worldwide, as they are carriers of deadly diseases such as malaria, dengue fever, and Zika virus. However, if we consider direct attacks on humans, saltwater crocodiles are believed to be responsible for the most deaths among any animal. This is especially true in regions such as Southeast Asia and Australia, where crocodile attacks are relatively common. Other animals known to have caused significant fatalities include snakes, hippopotamuses, elephants, and sharks. It is worth noting that human actions such as habitat destruction and poaching can contribute to these numbers.