Ever-Clever Wrens

During the "Grackle Blackout" I have let the feeders empty themselves, although one suet feeder remained full.  And that's because the birds didn't get the concept behind this suet feeder that is only accessible to birds which do not mind hanging upside down.  Eventually, I figured, one of them would clue in and the feast would begin.  And today I caught a quick shot of a wren doing exactly that.  Around here, once one bird gets a good idea others follow.  But this feeder will remain off limits to a cadre of birds.  Grackles, for one.   So perhaps the wrens will enjoy their success for a long time!