gorilla nyoubou
The gorilla nyoubou, literally "gorilla wife", is an Okinawan animal bride tale recorded in "A Collection of Folk Tales from the Yomitan Village Vol. 5; Folk Tales from the Gima Section" published in 1983.
Even if we keep in mind that the narrator of this folk tale was born in 1916 and that his telling was recorded in 1977, the appearance of a gorilla in any folktale originating from the vicinity of the Japanese islands is extremely rare.
The book in which the folk tale was published records it in both its original oral Ryukyuan and in its standard Japanese translation.