Occurred on May 8, 2017 / Bozeman, Montana, USA
Info from Licensor: "Each year a mother duck lays her eggs in the Bozeman High School courtyard. When the eggs hatch, she knocks on the door with her bill until the door is opened and she leads her ducklings to the Mandeville Creek in front of the school. I have a 2014 video of the same thing but the quality isn't as good."