So in French, for people, feminine words tend to derive from masculine words, and masculine is generally the "default" gender, so when you're talking about an unspecified person or group of mixed gender, you use the masculine pronouns "il(s)".
But what about animals? Lots of animal names are, by default, feminine, such as "souris", "girafe", "chèvre", etc. What would the "default" third person pronouns be here? If you're talking about an unspecified goat, do you use "elle" or "il"?
Also, if there's no masculine name (such "bouc" for male goats), how do you refer to male animals with feminine names, such as "girafe"?