ZI writes: "Zoras have come in many shapes and forms throughout the Legend of Zelda series. There's the hostile River Zoras, and the more friendly Sea Zoras. With Oracle of Ages as the only exception, where both types of Zoras made an appearance, River Zoras are a staple of 2D titles and Sea Zoras are integral to 3D Zeldas.
We've seen Sea Zoras as eggs and infants in Majora's Mask; as children and adults elsewhere; and even as the Rito after their evolution in The Wind Waker. Fans have always assumed that the origin of the Sea Zoras could be attributed to Farore's creation of life; however Skyward Sword has more to say on the subject."