While this may seem a bit picky...

...I really agree with this article. These dolphins aren't used for the survival of humans but for their entertainment. I've always been disgusted by this sort of thing.

A hellish life for dolphins

"Except for a few notable exceptions, dolphins in captivity in Latin America face mistreatment from humans and the ills associated with being kept far from their natural habitat."

Humans are particularly disgusting creatures...