The chiffy below was singing at Cossie this morning. I grabbed a couple of shots as it was just overhead. Having just looked at the pix the untidy feathers around the base of the bill drew my attention. Looking closer it seems to me that the distal end of the upper mandible is missing. If so I wonder how it ever manahged to feed up to get here, unless it has overwintered, but even then how did it feed ... tongue and lower mandible?
Agreed with diagnosis??