Goat moth
reddish brown. The caterpillars are up to 10 cm long, pink when young, later with yellowish sides and a dark red back with a black head. The pupa is 5-6 cm long [...] lay eggs on tree trunks in batches of up to 50. After the eggs hatch, the larvae bore into the bark and down to the sap wood. Development takes 3 or 4 years [...] General The goat moth ( Cossus cossus ), is a pest of broad-leafed trees. It is most often found in birch, ash, willow and elm but can also attack fruit