Fanning for ventilation or the Nasonov pheromone?

It is always fun to see bees fanning the Nasonov pheromone into the air, signaling to the other bees “this is home, come on in, VFR direct!”  The difference between fanning for air circulation and spreading the Nasonov pheromone may be dectected by noting if the last body segment is bent down or not.  That is how the gland is exposed.

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