Zora's and the Winged People from Wind Waker

[Twilight Gale]

Maybe the Zoras got tired of swimming I guess. Maybe they felt a responsibility to deliver the mail across the new kingdom. Maybe fish scales are itchy. Idk.

No, I think they needed to do it to live.

 

[MsNerrrrd]

I think I don't need to explain it. Hyrule Historia confirmed it, and yes, they did evolve into Ritos.

 

[DarkestLink]

Because the plot demands it.

Nintendo saw a plothole with Zoras being able to breath underwater. So they covered it with another plothole.