Guess they don't see many humans in dark space.
Mass Effect Comic 'Boss Rush'
[Tali and Shepard are looking up at something]
Shepard: It's... a human reaper!
Tali: How could this happen?
[Cut to a reaper gathering, outside the galaxy]
Reaper A: The plans for the human reaper are due tomorrow!
Reaper A: Quickly, how many optics units do humans have?
Reaper B: Two!
Reaper C: Four!
Reaper A: Very well. We shall compromise.
[Human reaper shown to have three eyes, asymmetrically]
Human Reaper: Durrr...