There's a fascinating piece on the Duba lions of Botswana in the Daily Mail. Check out the intro:
"Marooned on an island, this group of lions should have died out. Instead, in an evolutionary twist, they've learned to swim and become strong enough to tackle their only prey... giant buffalo."
Strangely enough, the article goes on to say that the buffalo have actually flourished in response to the lions' predatory attention?! Crazy how nature works. Link via ThePresurfer.