Rattle

The is an item in SS undefined.

Location and Uses
If Link speaks to Bertie in the SS:, he will tell him to come to his house at night. If Link speaks to him again at night, he tells him that a bird has stolen his baby's Rattle, and wishes that someone would find it.

To retrieve it, Link must Clawshot his way onto the floating islands near the Waterfall Cave in Skyloft until he reaches one with a large pool of water. From there, he must dive down onto the bird's nest on a small windmill and use the Gust Bellows to uncover the Rattle. Once Link returns the Rattle, Bertie will reward him with five Gratitude Crystals.