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Mirelurks are creatures appearing in Fallout 3, Fallout 4 and Fallout 76. They are giant, radiation-mutated sea creatures of slightly varied species that seem to live in a symbiotic relationship with each other.
In Fallout 3, mirelurks are found in three variants: Mirelurks, mutated forms of Chesapeake Bay blue crabs (Callinectes sapidus); mirelurk hunters, mutated Atlantic Horseshoe crabs (Limulus polyphemus); and in the form of Mirelurk kings, mutated snapping turtles. They can deal massive damage, and can absorb a great deal in return thanks to their shells. Generally, they can be found near sources of water, including the Potomac River in groups of two or more individuals of one of the above groupings.
In Fallout New Vegas, a strain of mutated turtles native to Lake Mead and other large water bodies appears; resembling the mirelurk kings of the Capital Wasteland, these humanoid turtles are called lakelurks by the locals.
In Fallout 4 and Fallout 76, mirelurks appear markedly more crab-like in appearance than those in Fallout 3, 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 ricochet off them. Mirelurk hunters are mutant lobsters rather than crabs. Mirelurk kings are less bipedal, have more prominent fins and have a long tail. Fallout 4 also adds the mirelurk queen, a gigantic creature slightly taller than a super mutant behemoth.
A generic mirelurk, which lives close to the city's surroundings, or even the sewers.
A weaker version of the mirelurk found in Fallout 4 and Fallout 76.
Small, radroach-sized creatures that spawn from the eggs of a mirelurk clutch, or born live from the mirelurk queen. They appear to be baby mirelurks, and are instantly aggressive from birth.
A lobster-like creature that spits acid in splatter like shots.
Creatures that live symbiotically with other mirelurks, but according to Enclave research, appear to be mutated from snapping turtles. They use sonic attacks to kill their prey.
Mutated turtles native to the large water bodies of the Mojave Desert. They use sonic attacks to kill their prey.
Considerably larger and more dangerous than the other mirelurks. They have very large health pools, to the point they can even take several mini nukes to the torso without dying. One spawns at the Castle in Fallout 4 during the quest Taking Independence.
Can be found in the Nuka-Cola plant in Fallout 3. They are blue because of taking in strontium isotope from the Nuka-Cola Quantum. Their meat gives 10 action points. Commonly found in amusement park Nuka-World in the Fallout 4 add-on Nuka-World.
The Nukalurk queens can only be found in the Nuka-Cola bottling plant. She is a unique version of the mirelurk queen and has a blue glow due to the strontium isotope from Nuka-Cola Quantum. She has a large health pool, but when you finally kill her she drops Queen Nukalurk meat which when consumed gives you 120 hit points, 2 points in endurance but 30 rads. You can cook it at a cooking station to make a grilled version that has higher stats.
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