Many schools of Buddhism, including Indian Buddhism, Southwest Hinayana Buddhism, and Tibetan Tantric Buddhism, have developed, and many of them do not completely prohibit non-vegetarian food. Taoism pursues “natural nature, respect for life and virtue”. The study of Western vegetarianism is based on the idea that animals have or should have moral status. There are Peter Singer’s animal liberation theory, Leopold’s earth ethics, Taylor’s biocentric ethics, Schweitzer’s reverence for life ethics, and Tom Regan’s animal rights theory. Later, the vegetarians Bohm, St. Thomas More, and Locke, and the anthropocentrists Penn, Leibniz, Hume, and Rousseau discussed the relationship between humans and animals from their own perspectives.