Do Mosquitoes have to eat?

The quick answer is Yes. Like all living creatures they have to have some kind of nourishment to survive. Mosquitoes feed on blood and nectar. Which one, depends of the sex of the mosquito. The mosquito feeds on plant matter for sustenance, however, the female mosquito will feed on blood when she is going to lay eggs. And up to 300,000 of those eggs she will lay in small amounts of water. To keep this out of your yard, make sure you keep the water holding objects dry or treated.