Mosquitoes don't just have one straw-like proboscis, they actually suck your blood with six tiny needles. Two needles covered with teeth saw into the skin, another two (called mandibles) hold the skin open once it's been sawed apart, one drools anticoagulating saliva into the wound to keep the blood flowing, and the final needle actually sucks the blood.
It's like this tiny pest is performing tiny surgery every time it "bites" you.
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