Of the more than 3,000 species of #mosquitoes in the world, just a small number have evolved to specialize in sucking human blood.
How human-biting mosquitoes track us down so effectively isn't currently known, but it matters, since they don't just make us itch. They also carry dangerous diseases such as #Zika, #dengue, West Nile virus and #malaria that can be deadly.
In fact, stopping these pesky insects in their tracks could save up to half a million lives lost to those diseases each year.
