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Figure 1


Fig. 1. Calculated pressure drop versus nectar intake rate for proboscis radii ranging from 0.02 to 0.06 mm. The atmospheric pressure line (broken horizontal line) represents the putative upper limit of the pressure drop that can be developed in the cibarium. The viscous limit line (broken vertical line) represents the most viscous sucrose solution from which orchid bees have been observed feeding.





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