Have you ever been around rabbits? My family raised them when I was younger for food. I'll tell you what, they can "breed". There are some areas that consider rabbits a straight pest, worse than weed plants.David said:All I'm saying is that it doesn't seem right to put a perfectly healthy animal which has an otherwise potentially long and fulfilling (reproductively speaking).
Other areas have had to introduce various snacks and other predators to deal with rabbits that weren't meant to be there in the first place.
Mice are almost as bad once they get a foot hold...

I have never heard of rabbits being fed to snakes though, this was a first and unless it was a "Really Big" snake, that doesn't seem quite right..

But you also have to understand that most snakes kill there food quickly, either by venom or crushing. There is no suffering time (other than fear of death).
What was done to the Oscar is different in my opinion. It wasn't a fair fight, but it wasn't a one sided fight either. If there had been enough pirhanas, or the pirahnas had been large enough, to make a quick end then it would not have been as bad.
I don't agree with having fed the Oscar to the Pirhanas, but each to there own. What I believe was wrong was in the fact of the time it took for it to happen.