Mirelurk (Fallout 3)

The mirelurks are a species of bipedal, mutant crabs from the Capital Wasteland area.

Background
They are descended from Chesapeake Bay horseshoe crabs. The full scientific classification of the mirelurks is Kingdom: Animalia Phylum: Arthropodia Subphylum: Crustacea/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.

Most mirelurks are surrounded by a shield which is difficult to penetrate, even with powerful ballistic and laser weaponry. The face is more vulnerable, but is small and hard to hit, and when charging, mirelurks lower their head, protecting this area.

Mirelurk meat, especially of the soft shell variety, is highly nutritious and grants some of the highest HP replenishment of all the food in the game. Both still are slightly radioactive, but no more than typical food.

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

The most common type of mirelurks have a whitish-grey shell, are about a head shorter than a typical 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 head-butt, which also makes it impossible to target their face. They drop mirelurk meat when killed.

Their presence in the Capital Wasteland is mostly limited to rivers and water pools. This makes them common around the Potomac, in increasing numbers further north. They also infest some vaults and sewers. Mirelurk packs are usually found around eggs or chasing and harassing other creatures and usually come in numbers of 1-3 or sometimes 4-5.

Mirelurk Hunter
A much larger, reddish-brown colored version of the mirelurk. In additional to their two main arms, hunters also have 2 pairs of small, vestigial crab limbs growing out of their chest. Mirelurk hunters inhabit 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 violent and are more difficult to kill due to their increased strength, speed, and health.

Mirelurk King
Mirelurk kings are different from other mirelurk variants, mainly because they do not resemble their crab-like "subjects", but are mutated snapping turtles and appear more like mermen. They are fully humanoid, and do not have a heavily armored carapace, making them easy to distinguish from standard mirelurks. They're most likely a separate species in a symbiotic relationship with the crab-like mirelurks.

Mirelurk kings lack the mirelurks' armored shell, but to compensate they have extremely high health (slightly higher than that of a super mutant master). They also have a sonic projectile attack that disregards damage resistance (and causes a lot of limb damage to your head). Kings are found few and far between in the Capital Wasteland, outside, but more so in caves and sewers, and do not present any other special loot or items over mirelurk hunters, except for soft shell mirelurk meat, which is one of the best foods in the game. Of note, they infest the Reactor area of Vault 92. They only appear when the player is at very high levels.

Swamplurk
A type of mirelurk which has altered colorization to better blend in with the environment of Point Lookout.

Swamplurk Queen
Swamplurk queens are similar to mirelurk kings, except they have glowing yellow eyes and a look adapted to the swampy environment they live in. They also have a ranged attack in the form of spitting which causes medium damage.

NukaLurk
A glowing blue mirelurk that is only found in the Nuka-Cola Plant, almost certainly due to the isotope used for Nuka-Cola Quantum. They seem to be bigger and faster than the normal mirelurks, similar in size to the mirelurk hunters. Their meat is notable for a small boost in AP as well as Radiation and Health; 4 Rads, +10 AP, and +20 HP.

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

Appearances
Mirelurks appear only in Fallout 3 and its add-ons.

Gallery
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