User blog comment:JediSpectre117/Regarding the surviving Prothean./@comment-76.84.49.247-20120222085644

The Collectors look much different from the Protheans because of the cloning procedure used by the Reapers after they could not make a Prothean Reaper. After several hundred clonings the DNA basically corrupted and morphed into the bug like things that are known as the Collectors.