Mosquitoe

The females of most species have piercing and sucking mouth parts and they must feed at least once upon mammalian blood before their eggs can develop properly. During the blood meals the females may either acquire or transmit various disease organisms. It is she who produces the characteristic whining sound by vibrating thin horny membranes on the thorax. The eggs are laid singly or glued together to form rafts, usually in stagnant water in ponds, pools, open containers, and other aquatic habitats. Mosquitoes have become adapted to extremes of climate and are found far north of the Arctic Circle, where they winter as larvae frozen in the ice. Mosquitoes are the vectors of several diseases and health experts are warning travellers to take precautions against being bitten by mosquitoes amid a worldwide increase in dengue fever.

Where are they found?

Mosquitoes are always associated with water as they need water to breed in and develop into adults.

Only female mosquitoes bite. Mosquitoes are attracted to heat, light, perspiration, body odor, lactic acid and carbon dioxide.

How do mosquitoes locate us?

Chemical sensors - mosquitoes can sense carbon dioxide and lactic acid up to 100 feet (36 meters) away. Mammals and birds gives off these gases as part of their normal breathing. Certain chemicals in sweat also seem to attract mosquitoes (people who don't sweat much don't get nearly as many mosquito bites).
Visual sensors - if you are wearing clothing that contrasts with the background, and especially if you move while wearing that clothing, mosquitoes can see you and zero in on you.
Heat sensors - Mosquitoes can detect heat, so they can find warm-blooded mammals and birds very easily once they get close enough.

How to treat mosquitoe bites:

Treat mosquito bites by washing them with soap and water.
Avoid scratching the bite area by using anti-itch medicines, such as Calamine lotion.