In the animal world, many herbivorous grazing animals including cows, sheep, horses, and reindeer avoid feces when feeding. Primates also prefer to forage away from feces-contaminated areas. The aversion is believed to be a strategy to avoid infection.
- Robert Jean Campbell (2009). Campbell's Psychiatric Dictionary. Oxford University Press. pp. 375–. ISBN 978-0-19-534159-1.
- D.L. Wingate, "Everything you wanted to know about constipation and incontinence but were afraid to ask." In: Constipation and Anorectal Insufficiency (FALK Symposium. 1995), 1997, ISBN 0792387279, p.4
- Goldman, Jason G. "Why do humans hate poo so much?". www.bbc.com. Retrieved 2019-03-30.
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