The difference in pain is due to the way each insect obtains blood. Mosquitoes have mouth parts that are highly modified for piercing; they have a sharp proboscis, a prominent tube-like part that extends from their head and houses organs known as stylets which work like hypodermic needles to penetrate the skin and suck up your blood.
Why does getting stepped on by a high heel seem to hurt so much more than getting stepped on by any other shoe? Find out on today's Moment of Science.