Quartrboard, Masonite CORPORATION, c.1930. Masonite is a type of hardboard made of steam-cooked and pressure-molded wood fibres in a process patented by William H. Mason. This product is also known as Quartrboard, Isorel, hernit, karlit, torex or treetex.
Max Wurr, Stanmore, UK. The largest (heaviest) flying bird today is the Kori Bustard (Ardeotis kori) of Africa, males weigh about 18kg, females about half that. The largest bird ever to fly were the Teratorns (a type of Condor), the largest of which, Argentavis magnificens, had a wingspan of 3 metres, and weighed 120kg.
Here, an illustration of what may be the largest flying bird, an extinct beast with a wingspan of 20 to 24 feet (6.1 to 7.3 meters) that flew the skies some 25 million to 28 million years ago.