Human beings are easily the biggest killers on the planet, killing not only other members of their own species but also of other species. The number of homicides alone is close to 500,000 per year. But what animal is the biggest killer of humans? It turns out that it is the mosquito, causing the deaths of about twice as many people as humans do. But the mosquito is not really the killer, it just serves as a vector for diseases. If one eliminates vector-carriers such a mosquitoes, flies, bugs, snails, and worms, the top four killers are in the order: snakes, dogs, crocodiles, and hippos.
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