this video was shot at the ko t contra costa mosquito control. ey're responsible for research, education, you know female mosquitoes, they have to feed on blood in order to produce eggs. >> yes. >> so dr. steve shuts is a volunteer food giver. >> oh, man! why is he -- oh, boy. >> he'll come out with about 300 bites. we're going to bring in our resident entomologist and tech guy, zach. there he is. >> hey there. >> this is so bizarre to me that this guy does this. >> i'm sure it's still itchy for him, but what happens is he's actually built up a resistance to the saliva of mosquitoes. >> why? why do this? >> the reason he does is mosquitoes need warm blood to feed. there are other possible ways of doing it, but he decided to volunteer himself because it's more cost-efficient. >> that's a tough classified ad, like to put out there, you know, job wanted, person willing to get stung by a million mosquitoes all the time, every day. >> they are there to research and do tests on these mosquitoes to help figure out ways to prevent diseases that are spread