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horn fly

a small bloodsucking fly, Haematobia irritans, that is a pest, especially of cattle.
1700-10, Americanism Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Encyclopedia Article for horn-fly

horn fly

(Haematobia irritans), insect of the family Muscidae (order Diptera) and a serious cattle pest. Adult horn flies cluster at the base of horns and on the neck and rump of cattle and suck blood. Their attacks cause loss of weight and milk production in affected cattle.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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