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One cluster can be found early, on the northeast shore of the lake east of Sanctuary Hills, just southwest of the Robotics disposal ground. Low-level characters may have difficulty with the mirelurks that guard it, however.
At least 40 mirelurk eggs named "Nukalurk eggs" can be found in the World of Refreshment and in the Nuka-Cola bottling plant. Upon picking them up, their name will change to "mirelurk egg."
Notes
Eggs that will hatch and spawn mirelurk hatchlings will be moving slightly. Shooting them or approaching will cause them to hatch and attack the Sole Survivor. Unhatched eggs from an egg cluster can still be destroyed if they aren't collected.
Mirelurk eggs are part of the materials required in order to construct mirelurk cages if Wasteland Workshop is installed.
It is also one of the ingredients required for the mirelurk cake recipe, which is a useful consumable that provides the player the ability to breathe underwater for half an hour.
Bugs
Playstation 4Xbox One When collecting unhatched Mirelurk eggs, the item may be added to your inventory despite not disappearing from the ground. This is purely a visual bug, and does not affect gameplay but can be confusing. [verified]