According to multiple sources, the animal that kills the most humans per year is the mosquito, which can transmit life-threatening diseases like malaria and dengue. Mosquitoes are responsible for an estimated 725,000 to 1 million human deaths annually. Other animals that are responsible for a significant number of human deaths include:
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Humans: Homicides account for an estimated 400,000 to 475,000 human deaths per year globally, making humans the second-most dangerous animals on the planet when it comes to human deaths.
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Hippos: Hippos are responsible for an estimated 500 human deaths per year.
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Snakes: Snakes cause an estimated 50,000 to 100,000 human deaths per year.
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Dogs: Dogs are responsible for an estimated 25,000 to 35,000 human deaths per year.
Its worth noting that different sources may have varying criteria and definitions for what constitutes a "deadly" animal, and some sources may only consider animals that directly kill humans rather than those that transmit diseases.