Hmmmm... I have to wonder about this. Recently the New York Times Sunday Magazine had a piece on how elephants are going insane. There was even an incident where a group of young elephants raped and murdered a rhinoceros. People studying this have concluded that the elephants are becoming psychotic as a result of drastic loss of social structure; it takes like 30 elephants to properly raise an elephant child.

So I wonder if this really has "always" happened among dolphins, or if it's also a recent development in reaction to their dwindling numbers.

The mouth looks photoshopped to me. Badly, at that. I suppose it could be real, but the whole muzzle area looks blurrier than the rest of the image.