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From Sonic Retro

Cluckbird is an enemy from Sonic Spinball, found in Toxic Caves, Lava Powerhouse and The Machine. It is a flying chicken that moves back and forth throwing you off course if you hit it.

Sonic Spinball (16-bit)
Sonic Spinball Main Article Enemies Bosses Bugs Cheat Codes Game Development Game Secrets Magazine Articles SCHG	Enemies and Obstacles: Buster Cluckbird Ferron Krondor Magma Worm Rexxon Unknown TM Enemy