From the Super Mario Wiki
Bones are semi-common enemies found in Creepy Castle and Fungi Forest at night. Unlike normal Kritters who attack by biting and punching, Bones attack by swinging a bone club that seems to be a part of their body. Bones can be defeated by simply pummeling them; whenever a Bones is hit with an attack, one of their body parts falls off. Bones also appear in several of the later Battle Arena Pads in Donkey Kong 64. They take at the most, three hits before going down, though an Orange or a Kong using its musical instrument can destroy them instantly.
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