ホモ・ハイデルベルゲンシス
"Homo heidelbergensis" was a close relative (most probably a migratory descendant) of "Homo ergaster". Some researchers believe this species to be the first hominin to make controlled vocalisations, possibly mimicking animal vocalisations, and that as "Homo heidelbergensis" developed more sophisticated culture, proceeded from this point and possibly developed an early form of symbolic language.