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Large fly. Follows people walking trails any time of day. Comes into clearings and gatherings at dusk. Bites really hard.
Abundant in the Amazon rainforest of SE Ecuador.
This is one fly that the native population try to watch out for. In the evenings you can see them jumping up, swatting, hitting each other (theoretically to kill flies :-). "The bite of the tábano is one of the most painful of any insect"