From J. Moorcroft (followup):

Re: What? Where? When? Some animals may know (Aug. 12): Hi, have a look at this video footage taken in the Kruger National Park, and consider whether these are conscious beings: Lions attack a small herd of Buffalo and isolate one; small herd leaves the scene but return a few minutes later with a big herd of Buffalo. They attack the lions and drive them off, saving the victim.