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This may be anecdotal...

The Indian sub-continent is in the rainy part of summer. It follows the mosquito population goes up.

So when I sliced my palm, I expected the mosquitoes to collect there in force. Yet whilst they continued to go about their business on the forearms, face and elsewhere - the blood flowing out of my palm held no attraction for them. This even after I deliberately stood still for nearly a minute! Perhaps the clotting process/platelets/etc were a repellent.

Why do mosquitoes not collect blood after platelets activate?

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I guess mosquitoes rarely have the opportunity to have available fresh blood. Therefore they did not evolve to recognize blood smell but only sweat smell (skin colors and animal shape). In other words, even if they had the physiology to take advantage of your injury, they are just not adapted to recognize it as an opportunity because they did not evolve for this purpose. –  Remi.b Aug 21 '13 at 17:03
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