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Olfactory memory and discrimination of outdoor winter bees, summer nurse bees and summer foragers. The x-axis displays the tested stimuli (conditioned odour carnation (CS) or new odour cineole) at 5 min, 24 h or 48 h after conditioning. The y-axis shows the percentage of bees displaying the proboscis extension response (PER). For statistics see text. The same individuals as in Figure 1 are displayed minus individuals that did not survive the 48-h test.
