referenceID fullReference Somanathan Somanathan H., Borges R. M. 2001. Nocturnal pollination by the carpenter bee Xylocopa tenuiscapa (Apidae) and the effect of floral display on fruit set in Heterophragma quadriloculare (Bignoniaceae) in India. Biotropica 33:78–89 Kelber Kelber A., Warrant E. J., Pfaff M., Wallén R., Theobald J. C., Wcislo W. T., Raguso R. A. 2006. Light intensity limits foraging activity in nocturnal and crepuscular bees. Behavioral Ecology 17:63–72.