It seems intuitive that bees herbivores that eat pollen and nectar.  Fascinating research by Dr. Prarthana Dharampal and Dr. Shawn Steffan has found that the diet of bees can also include a significant portion of microbes which serve as a protein “meat” source.  Their work was recently published in American Naturalist and Proceedings of the Royal Society B and was also featured in Scientific American: https://www.scientificamerican.com/article/surprise-bees-need-meat/

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