The oak hook-tip (Watsonalla binaria) is a moth of the family Drepanidae. It is sometimes placed in the genus Watsonalla. It is found in most of Europe except the far north. It is quite common in England and Wales but not found in Scotland and only recently in Ireland. The larva is brown with yellow markings and shows the typical drepanid shape with a tapered tail. It usually feeds on oak but has also been recorded on alder, beech and birch. The species overwinters as a pupa. 1. * The flight season refers to the British Isles. This may vary in other parts of the range.