Boo Buddy Swarm

Boo Buddy Swarms (also known as Baby Boos) are a group of Boos that first appeared in Super Mario World.

Super Mario World
Boo Buddy Swarms are only found in Ghost Houses in this game and they are always found at the top of the screen. Boo Buddy Swarms often move around quickly phasing in and out. The Boos that are visible will often swoop down at Mario attempting to damage him.