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M. C. Arizmendi, C. A. Dominguez, R. Dirzo, The Role of an Avian Nectar Robber and of Hummingbird Pollinators in the Reproduction of Two Plant Species, Functional Ecology, Vol. 10, No. 1 (Feb., 1996), pp. 119-127
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Arizmendi et al. (1996) studied this question.
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