Another moth from Moths of the World v4 They are also known as “Giant Silkmoths” and are found in Europe and across Central Asia, all the way to the Pacific coast. Their genus, Aglia, is composed of 6 Palearctic (North European) species. The wingspan is 60–84 mm (2.4-3.3 inches). Females are slightly larger and paler. The moth flies from March to July with a univoltine lifecycle depending on the location. The larvae primarily feed on European beech, but also birch, Alnus glutinosa, Salix caprea and Sorbus aucuparia. They can be found in older growth forests, with a large portion of trees in the Fagaceae family. They can also be found in younger riparian forests with less Fagaceae species present.