A large bird with a lengthy tail. Pokemon players can relate it to a less-fantastic Ho-oh; Final Fantasy players can relate it to a Phoenix, but without flame.
At first, these large birds can only be defeated after obtaining the Whip. Wait for its tail to stretch out, then target the tail to pull the bird down. Once this is done, you can then attack it with the sword to defeat it.
Later on, you can snipe them from afar with the Bow.