Is Steven Pinker borrowing from Diamond or just using a similar reference?

I am just finishing The Language Instinct by  Steven Pinker.   I'm amazed how similar the "Big Bang" Chapter is to Jared Diamond's The Third Chimpanzee in terms of data and theory contstruction.  However, I find it intersting that The Third Chimpanzeeis not mentioned in the reference section.  And Diamond is onlyreferenced once.  I will have to investigage further - perhapsboth these accomplished academic authors had similar sources.  (Ican expand once the blog is in non-test phase)