This week, the Chicago Cubs announced the first official mascot in their modern history. 

Clark, a "young friendly Cub," wears a backward baseball cap and Cubs jersey, along with blue sneakers. Clark will meet Chicago fans as they enter Wrigley Field in 2014. 

The Cubs have been without an official mascot for most of its 138-year history, but Clark will join new additions and improvements to the franchise, including a $300 million renovation to Wrigley Field. 

Clark was named after the Clark and Addison intersection where Wrigley Field is located. Clark was introduced to fans during a charity appearance Monday night. Cubs officials say Clark's great-grandfather Joa was the franchise's original live bear mascot in 1916.

With the addition of Clark, there are now only three teams in Major League Baseball without official mascots -- the Los Angeles Angels, the Los Angeles Dogers and the New York Yankees

Along with those three franchises, there are several other teams in major U.S. team sports without official mascots.

But for the franchises that do have furry representatives, here are 25 of the best mascots to ever grace a field or court in American professional sports.