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Mosquitoes are parasitic insects, and although we usually think of them as an annoyance (those itchy bites), they're actually the deadliest living thing on Earth.
More than 2 million people die every year from diseases spread by mosquito bites. These diseases include malaria, yellow fever, dengue, and West Nile Virus, and are most common in tropical and sub-tropical locations such as Africa, India, Central/South America, and parts of South Asia. Although there are occasional cases reported in other countries, many of these diseases have been effectively eradicated or controlled (Including in the USA and most of Europe).
Only female mosquitoes bite, and they do so to get nutrients needed to produce eggs. Male mosquitoes eat only nectar from plants.
Mosquitoes will lay eggs in any standing water- ranging from lakes, to puddles, or even a bucket left outside.