The Slotow Effect

A game reserve in South Africa spent years hunting a serial killer. The victims were rhinos. The horns were never taken, so it was not poachers. And the tracks at every kill site pointed to the last suspect anyone wanted to name. This is the true story of Pilanesberg National Park. In 1994, its rhinos started dying at a rate no one could explain. The investigation that followed involved helicopters, paint markings, rap sheets, and a suspect the rangers nicknamed Tom Thumb. What it uncovered went back decades, to the culls in Kruger National Park, and to a generation of orphaned elephant calves who grew up with no adults at all. Ecologist Gus van Dyk and biologist Rob Slotow traced the violence to musth, a hormone state that was arriving 10 years too early and lasting months instead of days, in young males who had never once been outranked. The fix had never been attempted anywhere. It worked almost immediately, and the finding was published in Nature. What this covers: The 1994 killings, and the evidence that ruled out poachers The Kruger culls, and why only the calves came out alive How elephant society is built to raise a male, and what happens without it Musth, and the invisible way older bulls keep it in check The 2-year surveillance operation on the park's own elephants The 6 bulls trucked in from Kruger in 1998, and what they did without trying What researchers found when they tested the orphans decades later The killers were never the mystery. The mystery was the world that raised them, and what that world was missing. The whole cure was presence.