Does anyone know how you tell the difference between a LSW nest hole and a Marsh/Willow Tit hole as I have various holes in a dead birch (see pic below) and wondered how to tell the difference.
I must admit when i saw your original post about the LSW holes, i did think to myself that they could be Willow Tits, as they excavate there own nest holes I don't think Marsh Tit do though, i believe that is why Willow Tit have the thicker neck