Mirelurk (Fallout 3)

The crabmen This is a The Vault descriptive term. The official name of this creature has not been announced yet. are a species of bipedal, mutant crabs from the Capital Wasteland area.

Appearances
The only known appearance of a crabman so far is in a piece of Fallout 3 concept art by Adam Adamowicz. It is not certain yet whether they'll actually appear in the game.