"They are very territorial, so while it's a little early for breeding season, your little tapper could have already staked out his territory and is determined to protect it, even if he is protecting it from himself. Few creatures understand that the birds they are seeing in windows and other reflective surfaces are actually just their own reflection. So they do what's natural and peck at the intruder to scare them away."
"Because he starts at a specific time and stops after a bit, I think it's probably a reaction to his reflection. Depending on the time of day, the sun's position makes surfaces reflective. As the sun moves higher in the sky, the reflective effect fades and disappears, and the bird can no longer see himself. You can cover the window to reduce its mirror-like properties, but often when trees leaf out, the problem disappears."
A dark-eyed junco repeatedly pecks at a bedroom window because it perceives its reflection as a territorial intruder. Juncos are highly territorial and will attack reflections even before full breeding season. Some pecking may target insects near the frame, but the timing and repetition suggest a reaction to reflected images. Morning sun angles can create mirror-like surfaces that disappear as the sun rises, ending the behavior. Covering the window or otherwise reducing reflectivity prevents the bird from seeing itself. When tree leaves appear the reflections often cease. Finches prefer nyjer seed most in winter, so nyjer uptake may decline seasonally.
Read at www.mercurynews.com
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