From Kirby Wiki
Fishbone (Tieru in Japan) is, just like his name suggests, a skeletal fish-like enemy from
Kirby 64: The Crystal Shards. They are made up of three triangular body pieces and they can fire their head towards
Kirby. The pieces come in different colors: yellow in the back, orange in the middle, and red as the head which has a spot for an eye. They also start from the back and grow larger. After a while they grow a new head. They give the
Cutter ability when swallowed. A giant Fishbone is a mini-boss found in Stage 3 of
Rock Star. If Kirby holds a Fishbone above his head, it will fire its head at enemies.
Its enemy card is #53.