"After reading this, I have been thinking about the feral hives that I have
boxed out of trees.  I would say that in the majority of cases, the
entrances are above the nest.  Some I recall were about half way."

Me too (not just trees). My last removals were a hive a couple feet down a
chimney, a hive under the gas meter box, an oak tree with several
entrances both under and over, and between two studs over a garage with an
upper entrance, and under the lid of a water meter. So that's 3.5 to 1.5.

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