Police are on the hunt for a man who tackled the Colorado Rockies' mascot during a game on Monday ... believing he committed an assault with his surprising actions.
The incident happened at some point during the Rockies' game against the Cardinals at Coors Field ... when Dinger, Colorado's purple dinosaur cheerleader, hopped up on a dugout to fire up the crowd.
Suddenly, though, as Dinger was dancing around ... video shot by a fan in the stands shows a man jumped up and took the costumed character to the ground.