Quote Originally Posted by Sin Magnum
i always take the 5 gil, i dont know anything about the birds. where are they at?
After you leave Costa Del Sol, you go to Mt. Corel (with the many rollercoaster like tracks).

Run along the tracks until you come to a little hut, the switch inside will
lower the bridge below. Now look at the slanted wall just outside of the hut, examine it around the middle to climb up. At the top there is a nest of birds, you can choose to take the treasure of not. The treasure is 10 Phoenix Downs and you'll have to fight a normal enemy.