Why are fans of college basketball wearing gorilla suits now?

Looks like the College fans of NCAAB are dressing up in Gorilla Costumes in order to heckle the home team. http://blog.washingtonpost.com/dcsportsbog/2008/01/the_crowd_at_pitt_more_gorilla.html

having not seen this personally, how exactly does this work? Do the regular students just show up in gorilla costumes and sit down? Or do they act like unofficial mascots and run up and down the isle’s?

What percentage of students are actually wearing animal (esp gorilla) costumes at these games anyway?

Um…I’m not sure they’re showing up to heckle the home team. But yes - students will show up wearing whatever costume they want (there are usually a few at each game) and cheer.