Kargarok

Making their first, appearance in The Wind Waker, Kargaroks were bird-like creatures that Link faced frequently in his quest.

The name "Kargaroc" is most probably derived from "Roc" (as in Roc's Feather), an item featured in various games in the Zelda series.

Wind Waker
Kargarocs (as their name was spelled in TWW, see Nintendo Gallery) were used by Ganon for surveillance and transportation of other monsters, such as moblins, across the sea. The Kargarocs were easily defeated when roosting, and were also susceptible to arrows (and cannon fire) when airborn. Often, Link could glean rare Golden Feathers from the tails of defeated Kargoroks, which fetched a nice price when presented to a certain guard on Dragon Roost Island. An interesting fact is that these creatures bear a resemblance to the Helmaroc King, the giant bird that kidnapped Link's sister, Aryll.

Twilight Princess
In Twilight Princess, Kargaroks have two distinct incarnations. The first is a common enemy in Hyrule Field, which attempts to knock Link off of Epona. The other version is it's Twilight form, the Shadow Kargarok, where it is recognizable save the head, which is ragged and open to look like a horn.