>> this is a dead elephant. they had a fight with the another bull. he has wounds on his back. >> circle of life. >> exactly. this is what we call natural selection. >> exactly. yeah. survival of the fittest. you see it everywhere. and all its gory glory. from the way marshall eagle devours a baby egrit, saving the drumstick for last. and then there is the way yesterday's adorable little impala becomes today's leopard lunch. setting up the kind of showdown most tourists dream of.