WildBird Care Wren House - Cedar Bird House Natural Wood BCH1A Design for Wren with 1 Entrance Hole. A Vinyl-Coated Steel Hanging Cable Slide-out Lockable Panel on Bottom for Easy Cleaning. 6 Side Holes for Ventilation at the Top and Drainage Slots at Bottom Weather Resistant and Insect Repelling.No Assembly Necessary The Hole Size Design for Wrens and Prevents Larger Birds from Entering