Marsh-hawk
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Ornithoica vicina
Ornithoica vicina is a species of louse fly in the family Hippoboscidae, first described by Walker in 1849. This parasitic dipteran is known to infest birds, with a documented host record from the Marsh Hawk (Circus cyaneus). Louse flies in this family are obligate ectoparasites of birds and mammals, characterized by their dorsoventrally flattened bodies and reduced or absent wings in adults, adaptations that facilitate movement through host plumage or fur. The species has been recorded from multiple localities including Brazil and Hawaii.