Quote from : Planet of the Apes Book

But once an original book has been written-and no more than one or two appear in a century-men of letters imitate it, in other words, they copy it so that hundreds of thousands of books are published on exactly the same theme, with slightly different titles and modified phraseology. This should be able to be achieved by apes, who are essentially imitators, provided, of course, that they are able to make use of language.