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(a) A foraging Bombus terrestris L. worker. To maximise nectar intake, a forager must avoid revisiting flowers it has already depleted. Photo credit: Andres Arce. (b) Radial-arm maze apparatus adapted for bumblebees. The apparatus consists of a circular array of eight artificial flowers on a vertical board with 10 × 15 cm wooden baffles between each flower. Two gravity feeders containing sucrose solution were provided on the central platform between training sessions.
