This can't be real': MLB fans in hysterics as animal rights
Bullpen' too offensive? Here's what PETA wants MLB to call it
PETA wants the MLB to rename 'bullpen' to 'arm barn' : NPR
What does the term 'bull pen game' mean in baseball? - Quora
FanGraphs Baseball, Page 2
ALDS Preview: Breaking Down Tigers vs. Orioles and Royals vs. Angels
Ben Rouse's Brewers Mission 162 Join me on my quest to attend
PETA Suggests MLB Should Rename Bullpen to More Animal-Friendly
Ranking the MLB teams ahead of the 2017 season - ESPN
ALDS Preview: Breaking Down Tigers vs. Orioles and Royals vs. Angels