The most dangerous animal in the world is the mosquito, which kills an estimated 750,000 to 1 million humans every year by spreading diseases such as malaria, dengue fever, West Nile virus, and Zika virus. Mosquitoes are the deadliest animals on the planet, despite being far smaller than most other animals. The second most dangerous animal to humans is humans themselves, with homicides accounting for an estimated 431,000 human deaths per year. Other animals that are considered dangerous to humans include:

• Hippopotamus: Responsible for 500 deaths per year due to their territorial and aggressive nature.
• Crocodile: Responsible for 1,000-5,000 deaths per year due to their immense bite strength and ability to hunt and prey upon humans.
• Elephant: Responsible for 500 deaths per year due to their sheer size and weight.
• Snakes: Responsible for 50,000 deaths per year due to their venomous bites.
• Dogs: Responsible for 25,000 deaths per year due to attacks on humans.

Its important to note that different lists have varying criteria and definitions, so lists from different sources may disagree and can be contentious.