What type of animal is the mascot for the Oakland Athletics baseball team?

The Oakland Athletics (often abbreviated to A's) are an American professional baseball team based in Oakland, California. The Athletics compete in Major League Baseball  as a member club of the American League (AL) West division. The club plays its home games at the Oakland–Alameda County Coliseum. The club has won nine World Series championships, the third most of all current Major League Baseball teams. The Athletics' 2017 season will be the team's 50th season in Oakland.

After New York Giants manager John McGraw told reporters that Philadelphia manufacturer Benjamin Shibe, who owned the controlling interest in the new team, had a "white elephant on his hands", team manager Connie Mack defiantly adopted the white elephant as the team mascot, and presented McGraw with a stuffed toy elephant at the start of the 1905 World Series.  By 1909, the A's were wearing an elephant logo on their sweaters, and in 1918 it turned up on the regular uniform jersey for the first time. Over the years the elephant has appeared in several different colors. It is currently white.

Since 1988, the Athletics' 21st season in Oakland, an illustration of an elephant has adorned the left sleeve of the A's home and road uniforms. Beginning in the mid 1980s, the on-field costumed incarnation of the A's elephant mascot went by the name Harry Elephante. In 1997, he took his current form, Stomper