Anyone who saw the Baltimore Ravens’ video of a giant bird circling M&T Bank Stadium could be forgiven for hoping the crowd survived the experience unscathed — except that the massive black raven swooping around the venue was a mixed-reality creation and didn’t actually exist. The bird was shown on the stadium’s video boards throughout the Ravens’ Dec. 12 game and in videos posted on the team’s social media accounts that night. The NFL team worked for several months on the project with the California-based fan experience company Famous Group and it made quite the splash once revealed to the wider world.