The Window Acraea (Acraea oncaea) is a butterfly of the Nymphalidae family. It is found in KwaZulu-Natal, Transvaal, Zimbabwe, Mozambique, from eastern Africa to Abyssinia and in Congo.The wingspan is 40–48 mm for males and 43–55 mm for females. Adults are on wing year round, with a peak from September to May. There are multiple generations per year.The larvae feed on Xylotheca kraussiana, Tricicleras longepedunculata and Passifloraceae species, including Adenia species.