[narag]

Native here. I know mosca, mosquito, mosquita, moscón, moscarda, moscardón and even moscoso and mosquearse.

But "mosco", really?

[felideon]

Native of where? In Colombia mosco or mosca is commonly used as fly, and zancudo is mosquito.

Mosquito is also mosquito if you're americanized.

[narag]

Spain. I have a colombiano friend and I've heard zancudo often, but not mosco. Never mind, I'm going to use mosco exclusively from now on to annoy fellow spaniards, it's catchy :-)