User blog comment:Cory Jaynes/Reapers origins/@comment-737801-20110801163628

We already know they aren't all Prothean Reapers. We actually don't even know if any of them are Prothean Reapers. If they were all PRs, then how do you explain the Derelict Reaper which is confirmed to be over 37 million years old? The Protheans went extinct just 50,000 years ago, so there’s a problem.

Also, There is a link in the Reaper article that explains a lot of things about them, which was then put into the article itself. Also just to say this, we've never seen an actual Prothean, so we don't know what they actually look like.