The evidence at best is fuzzy for bee recognition of faces. Both sugar water and quinine have unique odors that are probably readily recognizable by bees. And what do the feeders look like in the bee spectral range?

Jacques M. Dulin
Sequim, Wash.

For the test of bees’ face recognition, the researchers used empty, identical feeders to avoid just such clues. —S. Milius

From the Nature Index

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