Both males and females will sip nectar from willows, flowers and other plants to get the energy they need to fly. Also many kinds of mosquitoes rarely attack humans, feeding on birds or other animals instead. Female mosquitoes look for a red-blooded victim after mating. While some mosquitoes can produce eggs without a blood meal, for most of the common varieties of mosquitoes, no blood means no eggs. The general rule is that if they get a complete blood meal, they develop a complete egg batch and deposit it.
Male mosquitoes swarm when it is time to mate.
When females enter these living clouds, the males recognize them by the vibrations of their wingbeats, and they are all humming in the same key. If you have perfect pitch, you can attract the males, or you could use a tuning fork to attract them. Humans are not the only species harassed by mosquitoes. Thousands of mosquitoes can feed simultaneously on one caribou, literally harassing them to death in worst-case scenarios. Researchers have estimated that mosquitoes in northern Canada can reach densities of 12 million adult mosquitoes per hectare.