"The number of animals consumed in agriculture each year is estimated to be around 146 billion, approximately 56 billion land animals and 90 billion aquatic animals. [...] The number of animals consumed for food every eight months is roughly equal to the total number of Homo sapiens that have ever lived in the entire fifty-thousand-year history of the species."

- Streiffer and Basl, Ethical Issues in the Application of Biotechnology to Animals in Agriculture, 2011, chapter in The Oxford Handbook of Animal Ethics, page 827

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