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This is an overview article which contains background information and cross-game comparisons. For game-specific information and stats, see the articles linked on the right.
Gameplay articles
Fallout 3Mirelurk
Mirelurk hunter
Mirelurk king
Swamplurk fo3plGametitle-FO3 PL
Swamplurk queen fo3plGametitle-FO3 PL
Fallout 4Mirelurk
Softshell mirelurk
Mirelurk hatchling
Mirelurk killclaw
Mirelurk queen
Mirelurk king
Legendary mirelurk killclaw
Legendary mirelurk king

Mirelurks are creatures appearing in Fallout 3 and Fallout 4. They are giant, bipedal version of crabs that have been mutated by radiation.

General characteristicsEdit

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Mirelurks are mutated horseshoe crabs. Based on information from The Castle in Fallout 4, Mirelurks are often ambush predators that will disguise themselves as rocks, then jump out and attack when prey gets close. They can deal massive damage and can absorb a great deal in return. Hatchlings are shown to be highly aggressive, as egg clutches will often have at least one or two hatch and proceed to attack the intruder.

Their design has changed from FO3 to FO4. They are now more crab-like, and their posture is generally crouched down to make their vulnerable faces harder to hit. Their shells also possess a mild reflective quality, as lasers are often seen ricocheting off them.



Gameplay articles: Fallout 3, Fallout 4

A generic mirelurk, which lives close to the city's surroundings, or even the sewers.

Softshell mirelurkEdit

A weaker version of the Mirelurk found in Fallout 4.

Mirelurk hatchlingEdit

Small, radroach-like creatures that spawn from the eggs of a Mirelurk clutch.

Mirelurk kingEdit

Mirelurk king
Gameplay articles: Fallout 3, Fallout 4

Male mirelurks, boss-like creatures.

Mirelurk queenEdit

Large, powerful creatures of Fallout 4. They are capable of spawning Mirelurk Hatchlings and spraying the player with powerful acid.


Mirelurks appear in Fallout 3 Fallout: New Vegas and in Fallout 4.

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