This is a large heavy moth with a wingspan of 68–96 mm. The wings are greyish brown and marked with fine dark cross lines. The moth flies from April to August depending on the location.
The caterpillars have a red/purple stripe across the back and a black head. They reach a length of 9–10 cm. The caterpillars feed in the trunks and branches of a wide variety of trees (see list below), taking three to five years to mature. The caterpillar holes can be found low on the stem (maximum 1.0–1.5 cm above the ground). When ready to pupate the caterpillar leaves the tree to find a suitable spot.
The species prefer humid environments.
As a food
Pliny reported in Natural History that a grub which he gives the name cossus was considered a Roman delicacy after it was fed with flour. Some writers have equated this with Cossus cossus, but Pliny specifies that his cossus is found in oak trees, which makes this identification unlikely. Pliny's cossus is more likely to have been the larva of the beetle Cerambyx heros. 
Recorded food plants
It has a preference for Populus, Quercus and Salix.
Cossus balcanicus Lederer, 1863 from Bulgaria is probably a hybrid between C. cossus and Lamellocossus terebrus (Denis & Schiffermüller, 1775).
- Cossus cossus cossus
- Cossus cossus albescens Kitt, 1925 (Kazakhstan, Russia)
- Cossus cossus araraticus Teich, 1896 (Georgia, Azerbaidzhan, Turkey, Iran)
- Cossus cossus armeniacus Rothschild, 1912 (Turkey)
- Cossus cossus chinensis Rothschild, 1912 (China: Shaanxi)
- Cossus cossus dauricus Yakovlev, 2007 (Russia: Transbaical)
- Cossus cossus dersu Yakovlev, 2009 (Russia: southern Ussuri, Primorsky Krai)
- Cossus cossus deserta Daniel, 1953 (Mongolia)
- Cossus cossus gueruenensis Friedel, 1977 (Asia Minor)
- Cossus cossus kopetdaghi Yakovlev, 2009 (Turkmenistan)
- Cossus cossus kossai Wiltshire, 1957 (Iraq, Jordan)
- Cossus cossus lucifer Grum-Grshimailo, 1891 (Tibet)
- Cossus cossus mongolicus Erschoff, 1882 (Mongolia)
- Cossus cossus omrana Wiltshire, 1957 (Iraq, Iran)
- Cossus cossus tianshanus Hua, Chou, Fang & Chen, 1990 (Kazakhstan, Kyrgyzstan, Uzbekistan, Tadzhikistan, Afghanistan)
- Cossus cossus uralicus Seitz, 1912 (Uralsk)
- F. S. Bodenheimer, Insects as Human Food: A Chapter of the Ecology of Man, Springer, November 27, 2013, ISBN 9789401761598
- Skinner, Bernard (1984). Colour Identification Guide to Moths of the British Isles. Viking Press. p. 3. ISBN 0-670-80354-5.
- Waring, Paul; Martin Townsend (2003). Field Guide to the Moths of Great Britain and Ireland. British Wildlife Publishing. p. 23. ISBN 0-9531399-2-1.
- This information, or an older version, was partially obtained from De Vlinderstichting - Vlindernet – http://www.vlindernet.nl/ (geraadpleegd 18-05-2017).
|Wikimedia Commons has media related to Cossus cossus.|
|Wikispecies has information related to Cossus cossus.|