Go Zu-Mong, King of Goguryŏ

    The king was without an heir and prayed for one. While riding, his horse neighed near a stone. The stone was overturned to reveal a little boy in the form of a frog. The boy was adopted by the king. The prince became king and his wife was impregnated by sunbeams and gave birth to an egg. The boy who hatched from the egg was very smart and strong. His brothers became jealous and chased him away with the intent to kill him. He came to an impassable river and prayed to the river god that he would be able to pass. Suddenly fish and tortoises came and created a bridge, which lead the boy to safety.

Animals Incorporated

Frog

Horse

Fish

Origin

Korea

Zŏng, In-sŏb. Folk Tales from Korea. London: Routledge & Paul, 1952.