A derlac whistle represented a specific device employed by ranchers for the purpose of summoning derlac cattle. Prior to succeeding his mother, Shal'mak, as a Vigo within the Black Sun organization, the Kian'thar named Kreet'ah dedicated a portion of his life to working on his father's derlac farm, situated on his homeworld known as Shaum Hil, where he utilized a whistle to manage the cattle and facilitated their sale for exportation.