Hammer Bro.

Hammer Bros. (also pronounced Hammer Brothers), are a species of Koopa that stand upright and throw hammers at passing by-standers. They have been around since ''[http://www.mariowiki.com/Super_Mario_Bros. Super Mario Bros.]'' They have bigger shells than normal Koopas and wear headgear. They can also use special hammers to shrink their enemies. Hammer Bros. have many times been described as the most elite fighters in Bowser's Koopa army. These enemies were originally designed by Kazuaki Morita

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