A real Juvenile Goldfinch And Two Imposters

I think the pigeons have just discovered that they like niger seed.  Unfortunately their beaks are much too big to get at the seed in the feeder.  However, two of the feeders have trays at the bottom so the greedy pigeons have found the seed that the goldfinches, who are messy eaters, drop.  We have never seen them on there before but they have been back several times today.
Better seen large.