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Animal sacrifice is a part of Durga puja celebrations during the Navratri in eastern states of India. The goddess is offered sacrificial animal in this ritual in the belief that it stimulates her violent vengeance against the buffalo demon. According to Christopher Fuller, the animal sacrifice practice is rare among Hindus during Navratri, or at other times, outside the Shaktism tradition found in the eastern Indian states of West Bengal, Odisha and Assam. Further, even in these states, the festival season is one where significant animal sacrifices are observed. In some Shakta Hindu communities, the slaying of buffalo demon and victory of Durga is observed with a symbolic sacrifice instead of animal sacrifice.