From the Super Mario Wiki
Buster Beetles are bipedal, strong, and quick moving Buzzy Beetles that throw Ice Blocks at Mario and Luigi in Super Mario Bros. 3. The player can use any attack to instantly defeat them, as unlike most other members of the Buzzy Beetle family, Buster Beetles are not impervious to fireballs, nor do they hide in their shells when stomped. They appear in most underground cavern levels, especially in Ice Land.
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