Oracle of Ages stated the difference between river Zoras and ocean Zoras. Even then, the Great Sea probably had nothing to sustain Zora life. Therefore, they needed to adapt to live upon land. Then they came across Dragon Roost Island and Valoo, then they gained the scales needed to fly.

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Proud, patient, and wise Nayru clan member.
Follow the rules or suffer the wraith of the mods.
"It is wrong always, everywhere, and for anyone, to believe anything upon insufficient evidence." - W.K. Clifford