The nocturnal lion tracking operation takes place in the Tsavo bush of southeastern Kenya, one of Africa's largest wilderness areas — the transcript notes it is more than five times the size of the Grand Canyon. This vast savanna landscape, largely unfenced and shared between expanding Maasai farming communities and free-roaming predators, is managed in part by the Big Life Foundation, which protects over 1.6 million acres across East Africa. Visitors to the region encounter classic East African thornbush, dry riverbeds, and the iconic red dust of Tsavo, with elephants, buffalo, leopards, rhinos, and lions — Africa's "big five" — all potentially visible. Gates came here to investigate whether modern lion behavior, particularly the pairing of two male lions working together, might mirror the infamous partnership of the 1898 Tsavo man-eaters, giving the nocturnal tracking operation both a scientific and historical dimension.
Two male lions kill an estimated number of railway workers near Tsavo during construction of the Uganda Railway, later shot by Colonel J.H. Patterson
The Big Life Foundation is established to protect over 1.6 million acres in East Africa, including predator protection programs for lions
Gates joins Big Life rangers and a lion guardian biologist on a nighttime telemetry and thermal-camera tracking operation for Season 15 of Expedition Unknown
The Big Life Foundation's predator protection program, as explained to Gates on camera by head coordinator Daniel ole Sambu, represents a community-based conservation model designed to reduce retaliatory killings of lions by Maasai farmers. The program uses patrol vehicles, aerial surveillance, and GPS satellite collars to track individual lions, intervening before conflicts escalate. According to the transcript, this approach has helped produce one of the few lion populations in all of Africa that is, as Sambu puts it, actually growing — a remarkable outcome in a continent where lion numbers have declined sharply over recent decades.
Radio-collar telemetry and thermal imaging technology are now standard tools in big-cat conservation, allowing researchers and rangers to monitor animal movements in real time without physical disturbance. These methods stand in dramatic contrast to the reactive, rifle-based responses available to Colonel J.H. Patterson during the 1898 Tsavo railway construction crisis, when the only tools for dealing with problem lions were traps, bait, and patience. The pairing behavior observed during Gates' nighttime operation — two adult male lions traveling and, apparently, hunting together — is of genuine interest to lion ecologists, as cooperative male pairs are known to increase hunting success and territorial range.
Whether the two lions located during Gates' tracking operation share any behavioral or ecological parallel with the 1898 Tsavo man-eaters remains speculative. The episode explores the possibility as a framing device rather than a scientific conclusion. What the investigation does illustrate concretely is how human-wildlife conflict in Tsavo is an ongoing, dynamic challenge: as Kenya's population expands into lion territory, the pressure on both communities and predators intensifies, and organizations like Big Life operate on the front lines of that tension.
The episode's contribution is largely one of access and atmosphere — Gates and the crew accompany rangers on a genuine nighttime operation, capturing thermal-camera footage of wild lions in the Tsavo bush after dark, and presenting conservation fieldwork as the inheritor of the same dramatic landscape that made the 1898 man-eaters world-famous. No definitive historical conclusions about the original man-eaters are drawn from the tracking operation itself, and Gates is careful to frame the behavioral parallel as suggestive rather than proven.
The Big Life Foundation, which Gates visited, was founded in 2010 and protects over 1.6 million acres across East Africa as of the episode's airing.
According to the transcript, the Tsavo ecosystem is more than five times the size of the Grand Canyon — making it one of the largest protected wildlife areas on the continent.
Lions are actually nocturnal hunters, despite the famous lullaby 'The Lion Sleeps Tonight' — a fact Gates jokes about on camera during his Tsavo drive.
Big Life's predator protection program compensates Maasai farmers for livestock killed by lions if those farmers agree not to retaliate, helping support what the show describes as a rare, growing lion population in the region.
The Tsavo ecosystem is generally accessible to visitors through Tsavo East and Tsavo West National Parks, which are managed by the Kenya Wildlife Service and require entry fees; check current Kenya Wildlife Service advisories and park regulations before visiting. Guided night game drives, where permitted, offer the best chance of encountering lions and other nocturnal wildlife, though the specific routes used by Big Life rangers are operational and not tourist itineraries. Travel to the region typically routes through Voi or Mombasa, with the parks reachable by road or small charter flights.
Voi, Kenya, approximately 30–50 km from the heart of Tsavo East National Park, serves as the nearest significant gateway town; Mombasa is the nearest major city, roughly 150 km to the southeast.
The dry seasons — generally January through March and July through October — are considered the best times to visit Tsavo, as sparse vegetation and animals congregating around water sources make wildlife sightings more likely. The long rains (April–June) can make dirt roads difficult to navigate.
Tsavo, Kenya
Tsavo, Kenya is the broader historical and geographical setting of the 1898 man-eater crisis that Gates' Season 15 episode investigates, making it the direct companion site to this nocturnal tracking operation.
Tsavo River
The Tsavo River runs through the same ecosystem and is historically connected to the 1898 railway construction camps where the man-eating lions operated.
Voi
Voi is the nearest gateway town to Tsavo and likely served as a base of operations for the Gates production team during filming of S15E02.
South Africa (Kruger National Park region)
The Kruger National Park region in South Africa represents a comparable large African wilderness where human-wildlife conflict and lion conservation challenges are similarly studied and managed.