Wally the Green Monster is the official mascot for the Boston Red Sox. His name is derived from the Green Monster, the nickname of the 37-foot 2-inch wall in left field at Fenway Park. Wally debuted on April 13, 1997. Although he was an immediate success with children, he was not as well-received by older fans. Wally has since become more accepted by Red Sox fans of all ages, in part due to the Red Sox broadcaster Jerry Remy creating stories about him and sharing them during televised games.
Wally the Green Monster
Wally on a New York City subway in 2012
Wally at Frozen Fenway in 2012
The Green Monster is a popular nickname for the 37-foot-2-inch-high (11.33 m) left field wall at Fenway Park, home to the Boston Red Sox of Major League Baseball. The wall is 310 feet (94 m) from home plate and is a popular target for right-handed hitters.
The Green Monster as seen from the grandstand section on September 5, 2006. The ladder is visible to the right of the Red Sox Foundation logo.
The original ad-covered Green Monster in 1914, with "overflow" fan seating in front of the wall's base, atop "Duffy's Cliff" (seen in the distance, nearest the flagpole)
The center-field end of the wall (and Duffy's Cliff) in 1916, during a college football game at Fenway
The Green Monster in 1996, seven seasons before seats were added on top