What does an agitated male cardinal frequently singing and facing its reflection imply?

Answer

It is very likely treating the reflection as a rival male intruding on its claimed ground

During territorial defense, particularly in the spring and early summer months, male cardinals actively assert dominance over their perceived space. When a male encounters its own reflection in shiny surfaces like windows or mirrors, it interprets this image as an intrusive rival male encroaching upon its established territory, which may encompass a favored food source or nesting site. This agitation, often accompanied by aggressive behavior or constant singing, is a direct display of asserting dominance over perceived boundaries rather than interacting with the human presence inside the structure.

What does an agitated male cardinal frequently singing and facing its reflection imply?
birdfolklorehousesymbolismCardinal