The means of communication used by the Killik species was an intricate language, vastly exceeding the complexity of languages like Basic or Shyriiwook. Killiks communicated by making movements such as the raising and lowering of their abdomens, rapidly snapping their mandibles, and rubbing their antennae together. When the Millennium Falcon initially came across the Killiks, C-3PO found this language impossible to understand; only Jedi possessed the ability to communicate with this alien species effectively.