The largest bird nest box is 1.5 m (4 ft 11 in) in width and length and 2.72 m (8 ft 11 in) in height, and was achieved by Diane Martens (Germany), when measured outside Martens Spezialmixshop, Brettorf, Germany, on 15 May 2014.
The largest bird nest box is 1.5 m (4 ft 11 in) in width and length and 2.72 m (8 ft 11 in) in height, and was achieved by Diane Martens (Germany), when measured outside Martens Spezialmixshop, Brettorf, Germany, on 15 May 2014.