Another glorious day here in Nob Hill, ART notwithstanding.   Trying to keep it so, I am wondering if anyone has any ideas related to keeping bees away from my humming bird feeders?  During the past week or so, bees have suddenly demonstrated an  interest in a feeder.  I have two, one on each side of my driveway.  The bees are only interested in one, leaving the other alone.  Both have the same 4 to 1 ratio of sugar/water.  The presence of the bees at the one feeder is deterring the hummers.  Suggestions without hurting the bees would be appreciated.
Regards.