Mirelurk

Mirelurks are creatures appearing in Fallout 3 and Fallout 4. They are giant, radiation-mutated sea creatures of slightly varied species that seem to live in a symbiotic relationship with each other.

General characteristics
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 4, 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 appear to be mutant lobsters or crayfish 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.

Mirelurk


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

Softshell mirelurk
A weaker version of the mirelurk found in Fallout 4.

Mirelurk hatchling
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.

Mirelurk hunter


A lobster-like creature that spits acid in splatter like shots.

Mirelurk king


Creatures that live symbiotically with other mirelurks, but according to Enclave research, appear to be mutated from a different species (snapping turtles). They use sonic attacks to kill their prey.

Mirelurk queen
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 Fallout 4 during the quest Taking Independence.

Nukalurk


Can be found in the Nuka Cola factory in Fallout 3. They are blue because of taking in strontium isotope from the Nuka Cola. Their meat gives 10 action points.

Appearances
Mirelurks appear in Fallout 3 and Fallout 4.

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