The male has more teeth than the female in mankind, and sheep, and goats, and swine. This has not been observed in other animals.
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Book II, ch. III, section 13. [https://books.google.com/books?id=X7pfAAAAMAAJ&newbks=1&newbks_redir=0&dq=aristotle%20%22history%20of%20animals%22&pg=PA31#v=onepage&q=%22male%20has%20more%20teeth%20than%20the%20female%22&f=false Google Books]