Yep, these tiny buzzing creatures spread zika, dengue, malaria and more diseases which kill millions of people each year.
Lots of people find that they are bitten by mosquitos more than others, right? Is it the "sweetness" of your blood? Well, no. It's not. But there is definitely a reason you get bitten more than your friends.
It's got more to do with bacteria on your skin than anything else. This informative video from Tech Insider explains it in a really clear way.
So, next time you (or your mate) is moaning about how mosquitos seem to be more attracted to them than others - you can say, sorry pal but you are totally right....