Psychopomps (from the Greek word ψυχοπομπός, psychopompós, literally meaning the 'guide of souls') are creatures, spirits, angels, demons or deities in many religions whose responsibility is to escort newly deceased souls from Earth to the afterlife. Their role is not to judge the deceased, but simply to guide them. Appearing frequently on funerary art, psychopomps have been depicted at different times and in different cultures as anthropomorphic entities, horses, deer, dogs, whip-poor-wills, ravens, crows, vultures, owls, sparrows, and cuckoos. In the case of birds, these are often seen in huge masses, waiting outside the home of the dying. Classical examples of a psychopomp are the ancient Egyptian god Anubis, the deity Yama in Hinduism, the Greek ferryman Charon, the goddess Hecate, and god Hermes, the Roman god Mercury, the Norse Valkyries, the Aztec Xolotl, Slavic Morana and the Etruscan Vanth. Heibai Wuchang, literally "Black and White Impermanence", are two deities in Chinese folk religion in charge of escorting the spirits of the dead to the underworld. In Japanese mythology, the shinigami have been described as psychopomps. The form of Shiva as Tarakeshwara in Hinduism performs a similar role, although leading the soul to moksha rather than an after-life. Additionally, in the Bhagavata Purana, the Visnudutas and Yamadutas are also messengers for their respective masters, Vishnu and Yama. Their role is illustrated vividly in the story of Ajamila. In many beliefs, a spirit being taken to the underworld is violently ripped from its body. In the Persian tradition, Daena, the Zoroastrian self-guide, appears as a beautiful young maiden to those who deserve to cross the Chinvat Bridge or a hideous old hag to those who do not. In Islam, Azrael plays the role of the angel of death who carries the soul up to the heavens. However, he only acts by the permission of God. The polytheistic concept of a specific deity of death is rejected by Judaistic monotheism because only God is regarded the master of death and of life.