Sonja, the sports teams are usually plural; for some reason, they presented the singular.
It's the Boston Celtics in basketball, the Montreal Canadiens in hockey, the Green Bay Packers in football and the NY Yankees in baseball.
The trick I almost fell for was words from the song "Yankee Doodle", which include the words macaroni and feather. But, the spelling of Canadien gave it away; it's the French-Canadian spelling, so it had to go with Yankee as a sports team.