National Geographic - Blood Rivals: Lion vs. Buffalo (2015)
In Africa, no other herbivore rivals the buffalo with its brute force and collective strategy honed over millennia in an evolutionary blood feud with the ultimate predator. For most of the year the breeding herd fends off relentless attacks from the resident lion pride. Then, when the dry season sucks water away from the grasslands, they migrate beyond the reach of the killers, but risk starvation. Life is a perpetual Catch 22 for the buffaloes where payment for fresh water and sweet grasses is made in blood.