Bouncies are pink bubble-like things in Yoshi's Island DS. If one is touched, the character who touched it, will bounce back a few feet. Sometimes these mountain-like creatures can help the Yoshis by making them bounce a few feet in the air and letting them reach high places. The boss Six-Face Sal is similar to them and they are prominently featured in the minigame Bouncy Maze.
Bouncies first appear in Level 2-5 of Yoshi's Island DS; This level was called "Boing!".