See the article here: http://wildlife.org/bees-compete-for-flowers-with-elk-deer-and-cattle/
Read our paper here: http://www.bioone.org/doi/abs/10.3375/043.036.0412
DeBano, SJ, SM Roof, MM Rowland, and LA Smith. 2017. Diet overlap of mammalian herbivores and native bees: implications for managing co-occuring grazers and pollinators. Natural Areas Journal 36(4): 458-477.