Early this morning, I heard a tap-tap-tapping sound. Tracing it, I climbed halfway up the stairs and peered at the glass door leading to a tiny second-floor balcony.
I saw a (presumably male) robin perched on the balcony rail.
He was engaged in a long-term attack on his reflection in the glass.
This went on for hours. As I post this, he's still at it. It must be exhausting. He even looked like he was panting when I snapped these photos.
Ah, testosterone. What a birdbrain.