Youppi!, who got his start at Olympic Stadium, is named as the first official mascot of the Montreal Canadiens, becoming the first to ever switch from Major League Baseball to the NHL. The acquisition, reportedly at the cost of six figures, is made possible when the Expos leave the hairy orange arm-waving giant behind in favor of an eagle called “Screech” when they moved to Washington, D.C. to become the Nationals.

On September 16, 2005 — Youppi!, who got his start at Olympic Stadium, is named as the first official mascot of the Montreal Canadiens, becoming the first to ever switch from Major League Baseball to the NHL. The acquisition, reportedly at the cost of six figures, is made possible when the Expos leave the hairy orange arm-waving giant behind in favor of an eagle called “Screech” when they moved to Washington, D.C. to become the Nationals.

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Sources:
Baseball Reference September 16
National Pastime September 16
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game