A wooden birdhouse is depicted attached to a large, heavily barked tree trunk in Alvanovo, Bulgaria

A wooden birdhouse is depicted attached to a large, heavily barked tree trunk in Alvanovo, Bulgaria. The tree's bark is dark, thick, and deeply furrowed, with multiple gnarled branches extending upwards and outwards, largely devoid of foliage. The birdhouse is a rectangular structure made of light-colored wood, possibly pine, with a darker, overhanging roof. A circular entrance hole is centered on a lighter, rectangular facade panel of the birdhouse. Directly below the birdhouse, a small, light-colored rectangular electronic device with visible data matrix codes (e.g., QR code, barcode) is fastened to the tree trunk. The background consists of an overcast, uniformly light grey sky. No individuals, animals, or additional structures are visible in the scene. The barren branches indicate a dormant season.