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.

A sports video game based on the series, titled American Ninja Warrior Challenge, was released in 2009 for PS4, Xbox One, and Nintendo Switch.

Olympians could soon face the iconic Ninja Warrior obstacle course. ... with several partners to test whether it could be a fifth discipline of the Modern Pentathlon at the 2028 Olympic Games in LA.