James D. Ackerman, Michael R. Mesler, Karen L. Lu, Arlee M. Montalvo, Food-Foraging Behavior of Male Euglossini (Hymenoptera: Apidae): Vagabonds or Trapliners?, Biotropica, Vol. 14, No. 4 (Dec., 1982), pp. 241-248
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Ackerman et al. (1982) studied this question.