Songbird first appeared in BioShock Infinite, released in 2013, as the enormous winged guardian tasked with keeping Elizabeth in her tower in the floating city of Columbia. Part machine, part bird, the creature communicates almost entirely through screeches, roars and the sound of tearing metal, which made its audio easy to lift for memes. Clips of its call began circulating in gaming edits and soundboards as a shortcut for an unstoppable protector arriving, and it remains popular because the noise is unmistakably large and threatening.