A female Anopheles stephensi mosquito obtains a blood meal through its sharp labrum, which it inserts into a human host. Scientists said the species was likely responsible for a major malaria outbreak in Ethiopia in 2022. (CDC via AP) As the planet warms, mosquitoes are slowly migrating upward. The temperature range in which malaria-carrying mosquitoes thrive is increasing. Scientists have found evidence of the phenomenon from the tropical highlands of South America to the mountainous, densely populated regions of East Africa.