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Mirelurks are giant mutated horseshoe crabs living in the Capital Wasteland in 2277.

Characteristics

Biology

Mirelurks descended from Chesapeake Bay horseshoe crabs. The full scientific classification of the mirelurks is kingdom: Animalia, phylum: Arthropodia, subphylum: Crustacean/Chelicerata, class: Merostomata/Malacostraca, while order, family, and genus are left undetermined due to their mutation. The subphylum and class are disputed in an Enclave officer's field research terminal, as he believes horseshoe crabs and blue crabs both evolved into mirelurks, due to their DNA/RNA samples having markers from two different subphyla and classes. Furthermore, he and the player both fill in the missing order, family, and genus with the same answers (on the terminal, and in a Science dialogue check after completing the mirelurk portion of The Wasteland Survival Guide quest): Scylla serrata horrendus.

Mirelurks are always found in damp and aquatic areas such as the mouth of the Potomac river, in the river itself and around the dried up section of the Potomac river up north. If not in an aquatic habitat, mirelurks have been seen in dark, damp and cool areas like caves, metro tunnels, and derelict facilities that fit the description, like the Anchorage Memorial. However, mirelurks do not reproach from light; they can be seen during the day, swimming in rivers and walking along the banks. This is especially true around Arefu, the Potomac and the Anchorage War Memorial.

Gameplay attributes

Mirelurks are naturally armored throughout their body... with the exception of the face. Try using V.A.T.S. to target this area, and kill them before they get close enough to attack.Fallout 3 loading screen

All mirelurks, except for mirelurk kings, are surrounded by a thick shell which is difficult to penetrate, even with powerful ballistic weapons such as the Gauss rifle. However, their weak spot is the face, but the area is small and difficult to hit. When charging, mirelurks will lower their head to protect this area. However, they will swing their heads up during the attack animation, exposing their faces. The utilization of V.A.T.S. and an accurate weapon, such as a rifle, can be helpful. Low level players will find mirelurks to be among their deadliest enemies.

Mirelurks are extremely territorial, so if anything trespasses, they will attack on sight until it is dead. Even if the trespasser makes a run for it, the mirelurk will still pursue them ferociously until the trespasser is run down. Often mirelurks leave combat to go and get support from other mirelurks.

Mirelurk meat, especially the soft shell variety, is highly nutritious and grants some of the highest HP replenishment of any food in the game. This is reinforced by Grandma Sparkle, as she will tell the player that mirelurk meat is "the best meat you can get out here". Both are slightly radioactive, but no more than typical food. Chefs throughout the wasteland have developed many culinary uses for mirelurk; the most prominent being the creation of mirelurk cakes. In fact, a recipe for them can be found in a fridge in the Anchorage War Memorial.

Variants

Mirelurk

Mirelurk

The most common type of mirelurk has a whitish-gray shell, are about a head shorter than a normal human, and walk slightly slower than a human. Mirelurks fight with their claws and lack ranged attacks.

Additionally, at close range they can charge forward in a brief burst of speed for a headbutt, which also makes it impossible to target their face. However, their face is most vulnerable in the seconds after a headbutt, when their 'head' is raised.

Name (Form ID)StatisticsBehaviorAbilitiesItems
Mirelurk
0001CF83
Level
6
Experience Points
?
Perception
4
Hit Points
120‡
Damage Resistance
0%
Aggression
Very aggressive: Will attack enemies and neutrals on sight.Icon requiredIcon requiredIcon optional
Confidence
Foolhardy: Will never flee or avoid anyone.Icon requiredIcon requiredIcon requiredIcon required
Gamebryo AI attributes#Assistance
Helps friends: Will help friends and allies.Icon requiredIcon required
Attack
Melee (28 Damage)

‡ Due to their hard shells, shots on the torso only do half of the normal damage.

Mirelurk hunter

Mirelurk hunter

A much larger, reddish-brown colored version of mirelurk. In addition to their two main arms, hunters also have two pairs of small, segmented vestigial appendages growing out of their chest which they may attack with, but very rarely. Mirelurk hunters inhabit the Potomac River in the northern wastes and several sewers and caves near the metropolitan area of the Capital, along with a good number in the Anchorage War Memorial. Hunters are very aggressive and are more difficult to kill due to their increased Strength, speed, and health. They appear more frequently at higher levels. Their powerful pincers inflict heavy damage and can knock back low level characters easily.

Name (Form ID)StatisticsBehaviorAbilitiesItems
Mirelurk hunter
0001CF84
Level
9
Experience Points
?
Perception
6
Hit Points
250‡
Damage Resistance
0%
Aggression
Very aggressive: Will attack enemies and neutrals on sight.Icon requiredIcon requiredIcon optional
Confidence
Foolhardy: Will never flee or avoid anyone.Icon requiredIcon requiredIcon requiredIcon required
Gamebryo AI attributes#Assistance
Helps friends: Will help friends and allies.Icon requiredIcon required
Attack
Melee (50 Damage)

‡ Due to their hard shells, shots on the torso only do half of the normal damage.

Mirelurk king

Mirelurk king
Mirelurk Kings use a devastating sonic attack to debilitate their foes from afar.Fallout 3 loading screen

Mirelurk kings are different from other mirelurk variants, mainly because they do not resemble their crab-like "subjects". They are not crabs, but are mutated snapping turtles[1] that appear more humanoid and do not have a heavily armored carapace, making them easy to distinguish from standard mirelurks. They are possibly a separate species with a symbiotic relationship with the crab-like mirelurks. These appear more frequently at higher levels.

Mirelurk king sonic blast

Mirelurk king's sonic blast

Mirelurk kings have a sonic projectile attack that disregards Damage Resistance and causes lots of limb damage to the subject's head, crippling it.

Mirelurk kings can be pickpocketed, though they don't have anything in their inventory, and planting a grenade or mine grants bad Karma.

Unlike mirelurks and mirelurk hunters, they cannot float in water.

Name (Form ID)StatisticsBehaviorAbilitiesItems
Mirelurk king
0007C6EF
Level
12
Experience Points
?
Perception
7
Hit Points
375†
Damage Resistance
0%
Aggression
Very aggressive: Will attack enemies and neutrals on sight.Icon requiredIcon requiredIcon optional
Confidence
Brave: Will avoid/flee from threats only if severely outmatched.Icon requiredIcon requiredIcon requiredIcon optional
Gamebryo AI attributes#Assistance
Helps friends: Will help friends and allies.Icon requiredIcon required
Attack
Melee (35 Damage)
Attack
10 (sonic attack)‡

† Torso shots only do 2/3 of the normal damage.
‡ Instantly cripples target's head. Cannot be used if their head is crippled.

Nukalurk

NukaLurk

A mirelurk hunter variation indigenous to the Nuka-Cola plant. They are oddly colored, having a dark blue exoskeleton stippled with glowing blue features along certain regions of their bodies. This coloration is probably due to prolonged exposure and/or consumption of the radioactive strontium isotope that was used to color Nuka-Cola Quantum before the Great War. Interestingly, Nukalurks appear in both "regular" and "hunter" versions like their mirelurk cousins, yet the difference is purely cosmetic.

Their meat is notable for a small boost in AP (from the Nuka-Cola Quantum), in addition to Radiation and Hit Points. However, only 10 nukalurks appear in the game, limiting the amount of meat available to no more than 10, since they do not respawn.

Name (Form ID)StatisticsBehaviorAbilitiesItems
Nukalurk
00037B41
000854D7
Level
6
Experience Points
?
Perception
4
Hit Points
120‡
Damage Resistance
0%
Aggression
Very aggressive: Will attack enemies and neutrals on sight.Icon requiredIcon requiredIcon optional
Confidence
Foolhardy: Will never flee or avoid anyone.Icon requiredIcon requiredIcon requiredIcon required
Gamebryo AI attributes#Assistance
Helps friends: Will help friends and allies.Icon requiredIcon required
Attack
Melee (28 Damage)

‡ Due to their hard shells, shots on the torso only do half of the normal damage.

Swamplurk

Swamplurk

Swamplurks (designated "mirelurk" in-game) are a variation of mirelurk which inhabit the swamps of Point Lookout. They are visually identical to mirelurk hunters except for their size, their green-tinged shells due to the swampy environment and the lack of vestigial limbs on their abdomen.

Name (Form ID)StatisticsBehaviorAbilitiesItems
Swamplurk
xx00B001
Level
6
Experience Points
?
Perception
4
Hit Points
120‡
Damage Resistance
0%
Aggression
Very aggressive: Will attack enemies and neutrals on sight.Icon requiredIcon requiredIcon optional
Confidence
Foolhardy: Will never flee or avoid anyone.Icon requiredIcon requiredIcon requiredIcon required
Gamebryo AI attributes#Assistance
Helps friends: Will help friends and allies.Icon requiredIcon required
Attack
Melee (28 Damage)

‡ Due to their hard shells, shots on the torso only do half of the normal damage.

Swamplurk queen

Swamplurk queen

Swamplurk queens (simply called swamplurk in-game) are a variation of the Capital Wasteland's mirelurk kings that inhabit the swamps of Point Lookout. Like the mirelurk kings, they are mutated from snapping turtles native to local rivers. They look extremely similar to kings, distinguishing traits being a mossy coloration and strangely shimmering glowing yellow eyes.

Unlike mirelurk kings, the swamplurk queen spits acid from its mouth, similar to a centaur. Although not radioactive, this acid is highly damaging.

Even with its lack of clothing, the swamplurk queen can be reverse pick pocketed with explosives. However, this results in some negative Karma.

Name (Form ID)StatisticsBehaviorAbilitiesItems
Swamplurk queen
xx00A56C
Level
20
Experience Points
?
Perception
9
Hit Points
600†
Damage Resistance
0%
Aggression
Very aggressive: Will attack enemies and neutrals on sight.Icon requiredIcon requiredIcon optional
Confidence
Foolhardy: Will never flee or avoid anyone.Icon requiredIcon requiredIcon requiredIcon required
Gamebryo AI attributes#Assistance
Helps friends: Will help friends and allies.Icon requiredIcon required
Attack
Melee (60 Damage)
Attack
100 (spit)‡

† Torso shots only do 2/3 of the normal damage.
‡ Cannot be used if their head is crippled.

Catfish mirelurk

GiantCatfish

A humanoid, mutated catfish known as a "catfish mirelurk" also appears in The Art of Fallout 3,[2] the art book available with the collector's edition of Fallout 3.

Related quests

Notes

  • Mirelurks are unable to attack while swimming, rendering them as helpless as other swimming land creatures, despite their aquatic origins. The mirelurk king's sonic attack can injure the player while underwater when shot at from land. This can effectively make the player a sitting duck while in the water, since the player has no means of fighting back.
  • Mirelurks seem to ignore any and every weapon's "stopping power". Even a missile or Gauss rifle bolt to the face will not faze them or slow them down while they charge towards the player. Power fists and deathclaw gauntlets appear to repel them to some extent, but this is more likely due to their attack animations which tend to "push" things away.
  • A Brotherhood of Steel Initiate can be found burning a dead mirelurk with a flamer outside of Project Purity after it becomes operational. He notes that the mirelurks are dying in the new pure water and appear to survive solely in radioactive water. He also notes that they smell rather bad. There is also a Brotherhood of Steel Knight patrolling the catwalks, who comments on how they are encouraged to take potshots at the dying mirelurks.
    • Despite this, the mirelurks that re-spawn in the tidal basin do not actually die by swimming in the water, though they spawn with greatly diminished health, allowing the Brotherhood or the player to easily kill them. Over time, however, they wear down the Brotherhood members who fight them and kill them or cause crippling injuries.
  • Mirelurk make a loud, distinctive clicking noise, which will easily give away their presence.
  • At lower levels, mirelurks can be rather dangerous when first entering DC or any of the caves/lairs they inhabit.
  • As seen in Vault 92, White Noise seems to kill them, a rather easy solution to an otherwise difficult enemy.
  • Although nukalurks are filled with the isotope for Nuka-Cola Quantum, they can't inflict radiation on the player, despite the fact that the isotope itself is radioactive.
  • It appears that the mirelurk king is later used in Fallout: New Vegas, where it looks the same, but is given the name lakelurk.

Appearances

Mirelurks appear in Fallout 3 and its add-on, Point Lookout.

Behind the scenes

  • A mire is a tract or area of wet, swampy ground, bog or marsh. So the mirelurks' name is fitting, as they tend to lurk in mires.
  • The mireluck kings are similar in appearance to the creature from "Creature from the Black Lagoon."

Bugs

  • PCPC Mirelurks killed in water will often flip over on their fronts and twitch. This is purely a graphical glitch related to their wireframe. Sometimes they will twitch so much they fall right through the floor, or become trapped in walls and doors while constantly playing a collision noise that can alert other enemies.
  • PCPC Sometimes when mirelurks are killed on land, body parts will sink into the textures on the floor, as much as half their body, and the remaining parts will flail and bounce.

Sounds

  • Idle mirelurk

  • Mirelurk king sonic attack

Gallery

Concept art by Adam Adamowicz

References

  1. Fallout 3 loading screen
  2. The Art of Fallout 3, page 37
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