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With his black labrador retrievers Miga and Bela, Griffin hunts dove, quail and pheasant in the Permian Basin and Panhandle and he shot Impala and Blesbok in South Africa in 2009 and 2011.

Instead, the team found that lions and hyenas had similar ranges of neurons as prey animals of relative size, such as the blesbok and kudu.

Over the same period, the population of blesbok, a white-faced antelope, has grown from 2,000 to 250,000, with 90 percent on private land.

Ernst said he had to cut his blesbok herd to 250 from 500.

This year, dozens of runners were cut off by herds of galloping wildebeest and blesbok antelope, which kicked up huge clouds of dust in their wake.