Battle at Kruger/Jessica the pet hippo

It's been called one of the greatest nature videos of all time -- all caught on tape ... by accident. A pride of lions attacks a young buffalo. While working to take down their prey, an alligator attempts to wrestle the kill away from the lions -- a tug of war ensues. And just when that ends, the herd of buffalo return to rescue their own.
http://www.aolvideoblog.com/2007/08/08/battle-at-kruger/

Then there's the hippo named Jessica.
http://glumbert.com/wii/view.php?name=pethippo