Ice hockey, ringette, broomball (on an indoor ice rink, an outdoor ice rink, or a field of snow), curling, and bandy are all popular team sports. In fact, bandy has become so popular that it has its own season—between November and March. In Canada, hockey is known as "Inner-City Hockey" because it is played on frozen streets in urban areas where there is no room for a field hockey stadium. The game was originally called "mutton hockey" because players wore leather helmets shaped like sheep heads and used balls made from sheep's intestines for ball possession. In Europe, ice hockey is known as "street hockey". It is played on any surface available on a street, including asphalt, concrete, and gravel. No ice skating facilities are required; instead, each player carries their own stick and puck. In America, hockey is played on ice rinks located in gymnasiums or community centers. There are two varieties: "inline" hockey, which is played by one person at a time while "team" hockey involves four players on each side of the ice. Each player has a stick and a puck; they use these to try to score goals by putting the puck into the opposing netts (the empty space between the goal posts).