A Hyoi Pear?can be purchased at Beedle's shop ship and stored in the Bait Bag.

Make sure you always have three or four of them in your bag. These pears are used to attract seagulls, which you can then control and use to collect rupees, Pieces of Heart, or trigger switches. Don't bump into an enemy, however, as that will instantly scare the seagull away. Press R to return to Link (don't press it by accident). The easiest place to get Hyoi pears is from Beedle's Outset Island shop ship.