Busy Nuthatch Time

This past week or two has been a busy time for the Brown Headed Nuthatches.  They're working the peanut feeder very hard and as a result I am disinclined to shut it down yet. (I do this in the hot months).  The BHNs always seem to be active at the feeders in waves: busy, then hard to find, then busy again.  Perhaps they are feeding frantically in a nesting effort.  Or not.  I have only seen one bird but they do look identical in pairs!  It's always very entertaining to watch them.  I wonder how long I'll get in this wave?