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| A deer fly (Chrysops callidus) on a Formosan Sika Deer (Cervus nippon taivanus) [42.064225,-71.587003] |
Deer flies are pests to cattle, horses, deer, and even humans. Female deer flies bite such mammals in order to feed on their blood and even use it for their reproductive purposes, while the host animal under attack is harmed in the process, making this an example of parasitism.
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