From the forefathers headed by Bhṛgu Muni and other sons of Brahmā appeared many children and descendants, who assumed different forms as demigods, demons, human beings, Guhyakas, Siddhas, Gandharvas, Vidyādharas, Cāraṇas, Kindevas, Kinnaras, Nāgas, Kimpuruṣas, and so on. All of the many universal species, along with their respective leaders, appeared with different natures and desires generated from the three modes of material nature. Therefore, because of the different characteristics of the living entities within the universe, there are a great many Vedic rituals, mantras and rewards.