Mosquito A1 Exterminators The females of most mosquito species suck blood from other animals, which has made them the most deadly disease vector known, killing millions of people over thousands of years and continuing to kill millions per year by the spread of diseases. Most species are nocturnal or crepuscular (dawn or dusk) feeders. During the heat of the day most mosquitoes rest in a cool place and wait for the evenings. They may still bite if disturbed. Mosquito’s are adept at infiltration and have been known to find their way into homes via deactivated air conditioning units.