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Recordings of photoreceptor responses to single photons (‘photon bumps’) in four species of insects with different eye types and different activity periods. Halictid bees: (a) L. leucozonium (diurnal, apposition eyes) and (b) M. genalis (nocturnal, apposition eyes). Onitine dung beetles: (c) O. belial (diurnal, superposition eyes) and (d) O. aygulus (nocturnal, superposition eyes). Dots mark bump occurrences.
