Frank & Phronsie Humphrey wrote:
 
> -
> > thought their habit of clustering on front of hive was from the
> heat,
 
Yep, have the same thing just south of you in Poplar Bluff, Missouri.
It is the heat.  As a matter of fact, while working my hives today, A
dog was chasing a cat through my apiary and they were both walking...:-}
 
      Chris Michel