For the birds

Before last Saturday's outdoor NHL game in Pittsburgh, there was a quick shot of some penguins at the stadium.
PETA lost it.
Do they know anything about Pittsburgh and its Penguins?
A spokesperson for the Pittsburgh Zoo said that amimal safety was a top priority and that the penguins had zoo keepers and a veterinarian at the stadium.
“The penguins who attended the Winter Classic are some of the same penguins that participate in our weekend Penguins on Parade event," Pittsburgh Zoo spokesperson Tracy Gray said. "They are very comfortable around people and noises. In addition, it was a great enrichment opportunity for our penguins to be introduced to new sounds, sights, and smells. Keepers and our Senior Veterinarian were with the penguins at all times on the ice.”
How can you deny these penguins an "enrichment opportunity?"