The six-point buck sent chairs, desks, books and shards of glass flying. A boy suffered a small cut to his head, but there were no serious injuries.
Marty Alexander, the principal of Coopersville East Elementary School, says the unexpected guest dropped by Monday afternoon.
He says the teacher stayed cool, instructing her 23 startled students to drop to the floor as the deer bounded across the room. She then led the children into the hallway.
After a twitchy, 30-second visit, the buck jumped back through the window and ran away.