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![R5-D4 bad motivator](https://static.wikia.nocookie.net/starwars/images/f/f9/R5-D4_bad_motivator.png/revision/latest/scale-to-width-down/220?cb=20130226005006)
The antenna on the malfunctioning astromech droid R5-D4
Antennae were long, thin sensory appendages situated on the heads of certain species including the crustacean creature known as the Sleeper, which inhabited the planet Dathomir.[1] The antenna implanted into Aurra Sing's skull supposedly allowed her to sense fear in her enemies.[2] The OG-9 homing spider droid had two comlink antennae, and the NR-N99 Persuader-class droid enforcer had two communication antennae.[3] The R5 series astromech droid was also equipped with a dome-mounted antenna.[4]