The Facts About Mosquito Biology
When you say you've been bitten by a mosquito, that's not quite accurate. You've been bitten by a female mosquito. Only the females bite. Males feed on juices and nectar from flowers and fruit. The females feed on plant juices and nectar too, but they also need blood in order to lay eggs.

The high-pitched humming of a mosquito is not just an annoying warning to its two-legged victims. At certain levels of pitch, that sound is the female mosquito's mating call, which enables the males to easily locate the females even in darkness.

After mating, female mosquitoes lay their eggs in or near water sources. These eggs hatch into larvae, worm-like organisms that mature in water. So many larvae may hatch at once that they actually darken the water. The larvae mature in 4 to 21 days, depending on the temperature of the water and the species, then enter a pupal stage. Two to eight days later, they emerge from the water as adult mosquitoes.