Multiple sources describe mosquitoes as among the deadliest animals, largely because of the illnesses they transmit. They note that mosquitoes cause significant human harm through both blood-feeding and the spread of pathogens. One report cites research from Our World in Data indicating that mosquitoes kill about 760,000 people each year. The sources also say mosquitoes are responsible for a large share of infectious diseases—reported as roughly 17%—including malaria, dengue, yellow fever, chikungunya, and Zika. The reports further connect mosquito risk to changing environmental conditions, pointing to warming driven by human activity. They say warmer climates and longer summers allow mosquitoes to expand into new areas, increasing the possibility of outbreaks in places that previously had fewer cases. Overall, the articles present mosquitoes as a key driver of infectious disease burdens and emphasize that geography and climate can affect where mosquito-borne illnesses occur and how intensely they spread.