To identify the Rock Crab you have to look out for rocks without shadows and rocks on dirt patches except for [[Mining#Nodes|Nodes]].
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To identify the Rock Crab, you have to look out for rocks without shadows, sometimes slightly overlapping nearby rocks, as well as rocks on dirt patches (not including [[Mining#Nodes|Nodes]]).
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Striking a crab with a pickaxe enough times will knock the rock off of the crab's back and cause them to flee.
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The Rock Crab can only be dealt damage if it is mobile, and not hiding beneath its rock. You can strike an immobile Rock Crab with your [[pickaxe]] to make it mobile again. Striking a crab with a [[pickaxe]] enough times will knock the rock off of the crab's back, and will cause them to flee. Alternatively, setting off a [[bomb]] near the crab can remove its rock, and will cause it to flee as well.
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Attacking in rapid succession will allow the player to kill the crab before it hides and becomes invulnerable to attack.
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The crab will not be invulnerable if its rock has been removed.
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Alternatively, one can bomb the crab to remove its stone protection: