Antennapalps
From Wookieepedia, the Star Wars wiki.
Antennapalps were the retractable antennae of the Balosar. When extended, they provided a finely tuned sensitivity to sound, extending into the subsonic range. They could also sense surges in emotion and detect danger.
A Balosar could pass for a baseline Human with his or her antennapalps retracted.
