Juncos are staunchly committed to terra firma feeding, so they will usually be found in congress below a feeder station from where they can take advantage of spilled seed, rather than follow the habit of finches and cardinals, which acquire a perched position directly on the feeder. Either Axeman or Napper previously commented on always seeing juncos on the ground near their feeder but never actually at the trough. Since juncos are usually present in groups, the prospect of finding a place on a small feeder for all those concerned doesn’t represent a prosperous strategy, so the ground-based approach seems more accommodating. My backyard juncos have now been around long enough to have adapted to taking turns directly at the trough, showing remarkable patience, as one junco commands the feeder, another waits on an adjacent perch, while a third waits on another perch a meter farther away and a fourth junco positions itself on the wooden arbour keeping a watchful eye on all his comrades. While not a queue, in the traditional linear sense, they all take their turn. This queue mentality is so very British. When an officious cardinal shows up from on-high and then immediately casts its stink-eye on the orderly proceedings then the confederacy of juncos disburses. A chickadee might share the feeder with a cardinal, cuz a chickadee aint no chicken, but a junco cartel evaporates when threatened. Seeing red they plummet to baser behaviour on the ground. 
Junco (male) having watched other birds takes its turn on the feeder rail
While waiting for a spell on the feeder this junco waits patiently on an adjacent DIY perch
Cardinal arrives and gives everyone present the stink-eye instead of special dispensation
As district cardinal the seed must be assessed for quality and flavour. If any is left after the inspection and testing then the cartel can have the left-overs. That's the way the world works. I call it supervised dysfunction.
