Gusty

Gusties are long, happy ghost-like creatures in Super Mario World 2: Yoshi's Island, Yoshi Touch and Go, and Yoshi's Island DS. They always travel in huge packs, giving Yoshis extra eggs, and can be used as stepping stones to bounce off of in order to reach higher areas.

They appear in levels where the terrain is bumpy and uneven, and are often a nuisance; in addition to knocking the baby off Yoshi's back on contact, they can spawn endlessly in some areas.