Wren Bird Box - Bitumen Roof It’s time for nesting! Wrens are a common breeding bird and the Wren Bird Box will provide a lovingly and reliable home for nesting and raising their young. This has been crafted with FSC wood and a bitumen roof to ensure our feathered friends are safe from predators and to give them the greatest chance at nesting success. The entrance hole has a diameter of 30mm plus a side door for easy cleaning and keeping up bird hygiene. 16 x 11.3 x 21.5cm. Suitable for Wrens. There are less natural nesting opportunities for our little wrens because we tend to keep our gardens clear and tidy. They are brilliant nest builders, and you will often find them exploring shady, overgrown places on or near the ground. Give them a home in the Wren Bird Box and position it up a tree or wall, preferably somewhere overgrown or crowded, and be cautious of strong sunlight and the wettest winds facing the box. This will help a family of wren’s shelter against the cold and wet weather during winter months, and in return, they will sing loud and vibrant songs which you can enjoy from the comfort of your garden.