Borbo fatuellus, the long horned swift, long horned skipper or foolish swift, is a butterfly of the Hesperiidae family. It is found in tropical Africa and south-western Arabia. The habitat consists of wet forests, moist woodland and coastal bush. The wingspan is 33–42 mm for males and 40–43 mm for females. Adults are on wing year round, but are more common from October to May in southern Africa. The larvae feed on Ehrharta erecta, Setaria sulcata, Setaria megaphylla, Imperata cylindrica, Pennisetum, Panicum and Digitaria species.