Willow Tit/Tree Creeper

A long, thin  box designed for fitting to smaller willow/birch trees, low to the ground, to encourage willow tit.  Filled internally with damp sawdust/shavings/rotting wood as this species likes to excavate their own holes.  The narrowing top crevice is designed to be suitable for roosting bats. Also suitable for tree creeper without the sawdust infill.