Twilit Carrier Kargarok

The Shadow Kargaroc Rider appears when Link first travels to Lake Hylia in Twilight Princess. Fyer believes it was a customer at first, but then realizes it as a 'Monster'. The Bulblin nearby on the lakebed then uses a patch of Hawk Grass to summon a Shadow Kargarok, which it then mounts.

To attack, wait until the bird gets close to the ground and then jump on it. Press A rapidly to bite the rider. Do this several times to defeat it. Once the rider is dead, Midna will take control of the bird so that she and Link can fly to Zora's Domain.

Trivia
This enemy is slightly similar to the Grim Creeper, the Evil Eagle rider from Link's Awakening, since both hop on a vulture-like bird and are defeated in a similar manner. Also, the Shadow Kargaroc Rider wears a mask that is very similar to the Grim Creeper's face.