Why do only humans need to filter the water from the Earth to drink, while any other species can drink it directly? Why do humans use paper after defecating, while animals have a clean anus after defecation? What are some behaviors that seem smart but are actually foolish? What are some commonly thought unexplainable questions that have actually been explained by science?

One, risks associated with water microorganisms.

二、动物为什么不过滤

Translation: Why don't animals filter?

Reference:

[1] Li Baohong. Investigation of gastrointestinal parasite infection in herbivorous wild animals and deworming test [D]. South China Agricultural University, 2016.

[2] Pan Guanglin. Investigation and Research on Parasitic Worms of Wild Animals in Qinling Mountains Area [D]. Northwest A&F University, 2012.

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