From the article:
"..unlike their colour-blind counterparts elsewhere in the country that only smell blood at 15-20 metres."
Someone probably already mentioned this but mosquitoes don't detect animals by "smelling blood." They can sense high concentrations of CO2, which conviniently happens to be what humans exhale. The way propane traps work is by producing a large amount of CO2 thus attracting mosquitoes, and killing them when they get in range.