Exsul singularis, the bat-winged fly, is a species of fly that is endemic to New Zealand, first described by Frederick Hutton in 1901. The males have enormously expanded wings. The species is found in the south-western South Island and occurs mostly in high-altitude meadows near streams. It preys on soft-bodied flying insects and is believed to uses its wings to increase its body temperature to offset the cool temperatures of its alpine habitat.

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