Guay

Guays (グエー, Guei) are small, bird-like creatures that appear in several Zelda games.

Characteristics
The Guay is a dark, heron-like bird that is commonly seen flying above desert and lake regions in Ocarina of Time, Majora's Mask, and Twilight Princess. While the Guay is generally small, the Guay seen in Twilight Princess are much larger, and slow-moving at that. These birds are seldom seen alone, always taking to the skies in a flock similar to their real-life counterparts, and they always gather in open areas, for example, the Desert Colossus of Ocarina of Time and the Ikana Canyon of Majora's Mask. Aside from that, one lone Guay can always be seen flying around the exterior of Clock Town, in Majora's Mask.

As if Link was tasty prey, the Guay will hone in on Link and pursue him as long as he is within close proximity. This behavior works to Link's benefit the majority of the time, as the Guay, when defeated, often drop large quantities of rupees, so the closer they are to Link's weapon, the easier it will be for Link to target them and collect the rupees they yield. For example, in Twilight Princess, at Lake Hylia, and even at the outskirts of Hyrule Castle, there is a large flock of Guays that can be spotted using the Hawkeye and Bow. If every single one of them is killed, 73 Rupees will fall, in respect to the flock on site at Lake Hylia.

Weaknesses
Because the Guay are standard, overworld enemies, Link can defeat them using the full variety of his weaponry, from swords to arrows, from bombs to magic, and often in only one attack. However, like in Twilight Princess where the Guay tend to fly far above Link, the bow and arrow is the recommended weapon as it is able to target and reach such long-distances with ease.

Trivia

 * The Guay is one of three enemies in Ocarina of Time and Majora's Mask that have an enlarged version that comes after killing a certain number of standard Guay, along with Stalchildren and Leevers.
 * The solitary Guay that flies around Clock Town in Majora's Mask will ignore Link until he plays one of the four temple songs, at which point it will begin dropping progressively more valuable rupees.