Okay so I caught this bit here, and i think it's an easter egg/reference to Alien. Of course, yes, it's real art and science but then there's the fact that the original makers of the game took somewhat inspiration from the game Alien: Isolation, which also features the bird. Of course, in Ruin, it's a Glamrock Chica version.
Video - Markiplier, The King of Five Nights at Freddy's Game - Steel Wool Alien - Ridley Scott, James Cameron, and all of the people that made Alien.
