Mosquitos are little bastards that do more killing, spread more disease, and cause more annoyance than any other creature on Earth. That’s because they have a really sophisticated needle-like system for biting us to suck our blood. But exactly how they bite might surprise you.

It’s a gnarly process. The proboscis of the Mosquitos hides six parts: two shafts with tiny teeth are used to saw through our skin; another two are used to hold the tissue apart; a sharp labrum shaft is used to probe for a blood vessel to suck blood from it; and the final shaft is meant to drool saliva into us to keep our blood flowing. That’s six needle-like objects used to do the damn job of biting us.

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That last part, the hypopharynx, with the saliva is the one that causes the itchiness and is the one that delivers deadly viruses and parasites like Zika and Malaria.

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