Okay people, the avain species you see here are known as the Watarara, and are a creation of the author who wrote the non-canon Ocarina of Time manga (which they originate from). Additionally, it was confirmed in a translated interview that these guys were the inspiration for the Rito in Wind Waker.
The excerpt goes as follows:
For the episode "The Wind Waker", when we chose to situate the action in the middle of the ocean, we immediately felt the need to create a race that can move through the air. During long trips offshore, we needed faster characters capable of transmitting information to Link. It was at that moment that I remembered Watatara clan, you had invented for the adaptation of "Ocarina of Time." In short, I digress a bit about the initials but we are inspired by your work to give birth to Rito Race, creatures that are half-man half-bird that can move very quickly with their wings." —Eiji Aonuma (THE LEGEND OF ZELDA MANGA INTERVIEW TRANSLATED)