While the Egyptian goose (Alopochen aegyptiaca) is only known to most Europeans as an invasive species, it once had divine significance in its namesake homeland. Although its original distribution area extended across almost the entire African continent, it was particularly worshipped in ancient Egypt, especially around Thebes. There it was considered a deity, Gengen Wer, "the great cackler," whose loud cackle filled the primordial darkness and who laid the world egg in a mulberry tree in Heliopolis, from which light and the world then emerged. This deity was one of the various manifestations associated with the complex Egyptian pantheon, which included the fertility aspects of gods like Amun. People assumed that creation was a continuous cycle and that every human being hatched from an underworld goose egg.