From WiKirby, your independent source of Kirby knowledge.
Fishbone is a hovering foe noted for its ability to shoot projectiles at Kirby that resemble its head, debuting in Kirby 64: The Crystal Shards, and appearing in no game since then.
While common to underwater stages, these enemies can also float in thin air, usually above a Star Block, or within a small cave, from which they attempt to ambush and shoot Kirby with their boomerang-shaped bones. By ingesting these creatures, Kirby obtains the Cutter ability. Kirby can also hold a Fishbone above his head to use its attack to hit other enemies.