but I don't know anyone who has enough spare time to set up the experiment and watch long enough to catch a bee in the act.

Ditto that!  Been trying to catch photos of some things I see in the bee yard,  and dang its tough to be ready.   That Varro on a queen larve moves super fast,  those SHB larve in a capped cell do not like selfies!  The timing to photo this would have to be impeccable!


Charles

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