So he created an ingenious eight-part "American Ninja Warrior"-style obstacle course for squirrels to protect his bird feeder instead. And filmed his efforts in a now-viral video.

Fans of American Ninja Warrior will get to test their obstacle course skills at a new family entertainment center coming to Knoxville. Adventure Action Park will be a 66,000-square-foot locally ...

Obstacle course racing, or OCR, is a $500 million business, with the number of races increasing by 2,300 from 2014 to 2015, according to Running USA.