10. Mosquito
There is no creature on the earth, other than other humans, more deadly to human beings. The tiniest creature on this list also happens to be the most deadly. It starts as an annoying pinch on the skin when a female draws a blood meal. That’s not what kills you, however. It’s the infection that she inadvertently injected in you that consumes your body later; Malaria, Chikungunya, West Nile, Dengue, Zika, and whatever else they may carry in the coming years.