The Eastern Illinois Panthers are the men's and women's athletic teams representing Eastern Illinois University of Charleston, IL in the NCAA's Division I. Most Eastern Illinois teams, including the FCS football team, participate in the Ohio Valley Conference. The men's soccer and men's swimming and diving teams are associate members of The Summit League, and the women's rugby team is an independent. Eastern Illinois University's colors are blue and gray. The team mascot, a panther, was informally known as "Billy" until its name was officially changed to "Prowler the Panther," in 2003 and then changed back to "Billy the Panther" in 2008.