|Canto 4: Creation of the Fourth Order||Chapter 18: Prithu Maharaja Milks the Earth Planet|
Bhaktivedanta VedaBase: Srimad Bhagavatam 4.18.21
yaksha -- the Yakshas (the descendants of Kuvera); rakshamsi -- the Rakshasas (meat-eaters); bhutani -- ghosts; pisacah -- witches; pisita-asanah -- who are all habituated to eating flesh; bhutesa -- Lord Siva's incarnation Rudra; vatsah -- whose calf; duduhuh -- milked out; kapale -- in a pot of skulls; kshata-ja -- blood; asavam -- a fermented beverage.
Then the Yakshas, Rakshasas, ghosts and witches, who are habituated to eating flesh, transformed Lord Siva's incarnation Rudra [Bhutanatha] into a calf and milked out beverages made of blood and put them in a pot made of skulls.
There are some types of living entities in the form of human beings whose living conditions and eatables are most abominable. Generally they eat flesh and fermented blood, which is mentioned in this verse as kshatajasavam. The leaders of such degraded men known as Yakshas, Rakshasas, bhutas and pisacas, are all in the mode of ignorance. They have been placed under the control of Rudra. Rudra is the incarnation of Lord Siva and is in charge of the mode of ignorance in material nature. Another name of Lord Siva is Bhutanatha, meaning "master of ghosts." Rudra was born from between Brahma's eyes when Brahma was very angry at the four Kumaras.
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupada, Founder Acarya of the International Society for Krishna Consciousness