User blog comment:Hyaenidae/Pictures of Prothean and EDI squadmates./@comment-76.20.85.63-20120217223647/@comment-68.147.152.162-20120218163645

@ Ironreaper It is an infiltration unit, but the writing in the picture says that it once had skin over it - similar to a Terminator - so that it could actually infiltrate organic societies. That's why its body is "anotomically correct" as you put it, and can do facial expressions This is only speculation, but I'm guessing that it's some sort of Reaper/synthetic agent that you might have to fight, and EDI uploads herself to it at some point after you expose it and/or capture it. I could be wrong