OK...see....I received this cute feeder as a gift. I filled it with black oil sunflower seeds. The seeds were nearly gone and I had not realized it. A hungry little Chickadee flew inside the feeder, and was trapped inside. The little fellow was flying up inside the jar. The rescue involved slowly removing the metal tray and ta-da a free bird. This is a design problem for small birds. I think that I can put something...screening maybe to solve the problem.
