Chris wrote:
When they were
clustered for winter he sprayed the outside of the cluster with dye.
Gradually, over days, he was able to observe that the dyed bees entered
the lower part cluster , eventually to re-emerge near the top and go
round again, almost like a convection current.  

That is a great experiment. I always thought the bees would take turns being cold. But I didn't think it would take days before the bees get back to the inside. If the bees on the outside stay there for days, must there be another mechanism to keep them warm?

Jorg








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