Six million antelope swarm across an area the size of Illinois,in Sough Sudan, a mass movement of mammals…African Parks, the Johannesburg-based conservation group that manages natural areas on behalf of South Sudan’s government, allowed The Wall Street Journal access to the 58,000-square-mile wilderness on the eastern bank of the White Nile….Although scientists and, of course, locals have known about the migration for years, only recently have researchers understood its staggering dimensions. In 2023, African Parks conducted an aerial survey revealing the movement included some 5.1 million white-eared kob, which generally move in a U shape in and around Boma National Park, sometimes crossing into Ethiopia’s Gambella National Park…

The interethnic violence that plagues South Sudan has, to a degree, helped protect the animal migration…South Sudanese rebels fought for decades to break away from Sudan. The South, mostly animist and Christian, finally won independence from the largely Muslim North in 2011, but quickly descended into civil war along ethnic lines. The war ended in 2020, but fighting in 2025 suggests stability remains a distant hope.

Among the region’s ethnic groups, the heavily armed Murle people in and around Boma National Park are known for stealing cattle and children from the Dinka and Anuak. Fighting is a way of life for Murle men, who divide themselves into age sets. Younger men gain status by taking on the men above them, with sticks and AK-47s, sometimes with lethal effect. Their torsos sometimes bear decorative scars resembling assault rifles…The Murle are so intimidating that other ethnic groups keep their distance to the extent possible. That has created a sort of no-man’s-land both in the parks and the places in between. “You’ve got this massive space that has allowed the migration to flourish,” says John Vogel, manager of Badingilo park.

With war, however, have come guns, and the temptation to poach is strong. Increasingly, hunters armed with military-grade weapons have been mowing down entire herds of antelope and just taking what they can carry to market on motorcycles. In a single month this year, African Parks counted 14,000 antelope carcasses passing through the town of Bor, where each animal sells for about $50, a vast amount to a poor rural family…

Excerpt from Michael M. Phillips, Researchers Track World’s Biggest Animal Migration, WSJ, Sept. 6, 2025