A bird in a cage is a familiar sight if the bird is in the house. But a cage hanging on a tree in the middle of the forest is something abnormal and you must correct this issue in Red Bird Relief. The bird clearly doesn't want to be locked up. Living in freedom, she sang endlessly, and now sits silently, awaiting her fate. The one who caught the bird disappeared somewhere, perhaps went to catch another one, and you have a chance to free the feathered captive. The key is hidden somewhere nearby, the bird catcher did not take it with him, so you have a very good chance of finding it. Collect items, solve logic puzzles and they will lead you to the key in Red Bird Relief.
