It is the females who suck blood from hosts such as humans and other animals. They need the blood to help feed their eggs. The eggs of a mosquito are laid on the suface of a pool of water and that is where the babies are born. The high-pitched humming sounds that mosquitos make is caused by the frequency of their wingbeats. Mosquitoes are known to transmit such serious diseases as yellow fever, malaria, filariasis, and dengue.
Mosquitos are fast breeders and adults mate shortly after they are born.
In places where it rains often they are almost impossible to get rid of, because they multiply so quickly. There are three important mosquito genera. The Genus Anopheles, is the only known carrier of malaria. The genus Culex carries viral encephalitis and, in tropical and subtropical climates, of filariasis. The genus Aedes is a carrier of yellow fever, dengue, and encephalitis.