Richard H. White, Robert D. Stevenson, Ruth R. Bennett, Dianne E. Cutler, William A. Haber, Wavelength Discrimination and the Role of Ultraviolet Vision in the Feeding Behavior of Hawkmoths, Biotropica, Vol. 26, No. 4 (Dec., 1994), pp. 427-435
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White et al. (1994) studied this question.
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