opening at the opposite end of an animal's digestive tract from its mouth

The anus is the opening in the human body that is between the buttocks. It is at the end of the gastrointestinal system (including the organs that digest food), where feces or stool comes out of the body.

Tractus intestinalis anus.svg
Scheme of digestive tract, with anus marked.
The anus of a female and a male (right).
Anatomical terminology

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