Why do horse flies bite?



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    Horse flies are bloodsucking insects that feed on the blood of cattle, horses, and humans.  It is estimated that horse flies consume 1 cc of blood for their meal, and it has been calculated that 20 to 30 flies feeding for 6 hours would take 20 teaspoons. This would amount to one quart of blood in 10 days.  Horse flies are most active during the day and they are attracted to such things as movement, shiny surfaces, carbon dioxide, and warmth. 

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