Curious Chickadee Behavior Continues

It seems past years' behavior by the Carolina Chickadees (and others) at the nectar feeder continues unabated.  Some years ago the chickadees came to the idea that the hummingbird nectar feeder's ant moat was a nifty place to catch a drink.  And they taught, by example, the others.  Now I see more chickadees than hummers there!  Quite a piece of entertaining behavior.  And harmless.  One just never knows if they caught the idea elsewhere and if it is spreading!