Rewrite using a possessive noun: tails of five foxes

Answer:

“The five foxes' tails”

Explanation:

A possessive noun indicates ownership and is formed by adding an apostrophe and an “s” at the end, or just an apostrophe if the noun already ends in “s”. Generally, for nouns that conclude with an “s”, only an apostrophe is necessary, whereas for those that do not end with “s”, both an apostrophe and an “s” are added, such as in “the girl's house” and “the girls' house.”

Thus, to transform the phrase “tails of five foxes” into a possessive form, we insert an apostrophe into “the five foxes” (the owning noun) since it ends with an “s”:

“The five foxes' tails”