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Terrapins are armored Koopas with green shells that appear in Super Mario RPG: Legend of the Seven Stars. In the game, they are the weakest soldiers in the Koopa Troop, even weaker than a Goomba. A similar (and much stronger) enemy is the red-shelled Terra Cotta. The word "terrapin" is an ambiguous term referring to turtles, which Koopas are quite similar to.
Terrapins fight solo or in groups of two to four and attack their opponents by punching, which does not do much damage. They patrol the halls of Bowser's Keep in search of intruders, and appear mostly in the very beginning of the game, before Exor crashes into Bowser's Keep. They only had 10 HP and 1 attack power, and 8 defense; this made battling them good training for the player at that point in the game. Mario also gains no EXP for defeating them.
Terrapins are the precursors to the Koopatrols of the Paper Mario series. However, Koopatrols wear spikes on their helmets and have very different stats, being much stronger than the regular Terrapins, who are known for being the weakest enemies in the game, even weaker than the Goombas. Ultimately, their main purposes are identical in that they are both armor-clad Koopas Troopas who guard Bowser's Castle.
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