Tessie - Red Sox mascot

Tessie (@tessietgm) • Instagram photos and videos

About Tessie the Green Monster

Wally's Clubhouse

Tessie (@tessietgm) • Instagram photos and videos

Tessie - Red Sox mascot

Boston Red Sox mascots Wally and Tessie display the patch during a News Photo - Getty Images

Wally, Lenny Clarke star in new animated show – Boston Herald

Wally's Clubhouse

Boston Red Sox introduce Wally's little sister, Tessie

Boston Red Sox mascots, Tessie the Green Monster and Wally the Green Nachrichtenfoto - Getty Images

BOSTON, MA - FEBRUARY 03: Boston Red Sox mascots, Tessie the Green Monster (left) and Wally the Green Monster (right) pose for a photo during Boston Red Sox Truck Day on February

Where's Wally? The Kidnapping of the Red Sox Mascot

Boston Red Sox mascot Tessie The Green Monster performs on the infield before a spring training baseball game against the Baltimore Orioles on Thursday, March 17, 2016, in Fort Myers, Fla. (AP