More broadly, he has developed an intelligence network in the villages around the park, and pays for information leading to a conviction. He has forged alliances with the many private conservancies that border Kruger, effectively pushing its borders outwards. He has helped persuade South Africas government to impose substantially tougher penalties for poaching, and to open a permanent court in Krugers Skukuza headquarters whose judges understand whats at stake.

In neighbouring Mozambique, poaching was not even treated as a crime until 2014, but under international pressure its government has introduced stiff penalties, which are being enforced with varying degrees of rigour.

Joostes subordinates speak of him with admiration. He took us from having no direction and approach to the onslaught we were trying to deal with and guided our whole anti-poaching effort into a solid spear, Charles Thompson, the helicopter pilot, declared as we swept over Krugers seemingly infinite bush. Everyone was basically a nature lover and had never been in the military and he taught us how to fight in a guerrilla war.

His efforts have certainly slowed the carnage. Kruger lost a record 827 rhinos in 2014, 826 in 2015, and 662 last year, and the downward trend continues. The number of poachers arrested inside Kruger has risen from 123 in 2013 to 281 last year.

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Can modern technology save rhinos from poachers? - Telegraph.co.uk