Boo Buddy Snake

From the Super Mario Wiki

A Boo Buddy Snake is a strange enemy, appearing only in Super Mario World. It is comprised of many Boos, and bounces and rebounds off walls and ceiling, making it a very dangerous obstacle for Mario and Luigi. They are only found in a few Ghost Houses. Another similar Boo formation is the Circling Boo Buddies.

Boos
Characters	Bigger Boo • Boolossus • Boos in Luigi's Mansion • Bootler • Franky • Herbert • Igor • King Boo • Lady Bow • Lahla • Peeka • Spooky Speedster • Stanley • The Creepy Steeple Boo
Species	Atomic Boo • Balloon Boo • Big Boo • Big & Little Boo • Blindfold Boo • Bomb Boo • Boo • Boo Balloon • Boo Buddy • Boo Buddy Block • Boo Buddy Snake • Boo Guy • Boo Man Bluff • Broozer • Calm Fishin' Boo • Circling Boo Buddies • Dark Boo • Dark Dark Boo • Disappearing Boo Buddies • Fishin' Boo • Li'l Boo • Mad Big Boo • Mad Boo • Red Boo • Sleepy Boo • Stretch • Terekuribo