Crab Droids were battle droids used by the Confederacy of Independent Systems during the Clone Wars. They were nicknamed "muckrackers" because of their extensive use in marshy terrain. Their name was derived from their six-legged scuttling movement and organic appearance.
Other Variants of Crab Droids included tiny models for espionage and giant versions that served as mobile armor, which were capable of taking on Jedi. One rare variant was equipped with bubble wort projectors that could imprison their targets in force fields.