The South African government has revealed the number of rhinos illegally killed last year, suggesting measures to reduce poaching have had limited success.

A total of 1,028 rhino were poached from 1 January to 31 December 2017, compared to 1,054 in the same period for 2016, "representing a decrease of 26 animals”, the environment ministry said in a statement.

The figures came as a disappointment to conservationists.

“News of the reduction in numbers of rhinos killed illegally in South Africa for the third consecutive year is encouraging. However, the numbers are still far too high,” said Margaret Kinnaird, WWF wildlife practice leader.

Wildlife Photographer of the Year 2017 Show all 14 1 /14 Wildlife Photographer of the Year 2017 Wildlife Photographer of the Year 2017 Wildlife Photographer of the Year 2017 The good life - Daniel Nelson - Wildlife Photographer of the Year Daniel Nelson/Wildlife Photographer of the Year Wildlife Photographer of the Year 2017 Wildlife Photographer of the Year 2017 Giant gathering - Tony Wu - Wildlife Photographer of the Year Tony Wu/Wildlife Photographer of the Year Wildlife Photographer of the Year 2017 Wildlife Photographer of the Year 2017 Memorial to a species - Brent Stirton - Wildlife Photographer of the Year Brent Stirton/Wildlife Photographer of the Year Wildlife Photographer of the Year 2017 Wildlife Photographer of the Year 2017 The jellyfish jockey - Anthony Berberian - Wildlife Photographer of the Year Anthony Berberian/Wildlife Photographer of the Year Wildlife Photographer of the Year 2017 Wildlife Photographer of the Year 2017 The ancient ritual - Brian Skerry - Wildlife Photographer of the Year Brian Skerry/Wildlife Photographer of the Year Wildlife Photographer of the Year 2017 Wildlife Photographer of the Year 2017 Stuck in - Ashleigh Scully - Wildlife Photographer of the Year Ashleigh Scully/Wildlife Photographer of the Year Wildlife Photographer of the Year 2017 Wildlife Photographer of the Year 2017 Contemplation - Peter Delaney - Wildlife Photographer of the Year Peter Delaney/Wildlife Photographer of the Year Wildlife Photographer of the Year 2017 Wildlife Photographer of the Year 2017 Palm-oil survivors - Aaron Gekoski - Wildlife Photographer of the Year Aaron Gekoski/Wildlife Photographer of the Year Wildlife Photographer of the Year 2017 Wildlife Photographer of the Year 2017 The ice monster - Laurent Ballesta - Wildlife Photographer of the Year Laurent Ballesta - Wildlife Photographer of the Year Wildlife Photographer of the Year 2017 Wildlife Photographer of the Year 2017 Crab surprise - Justin Gilligan - Wildlife Photographer of the Year Justin Gilligan/Wildlife Photographer of the Year Wildlife Photographer of the Year 2017 Wildlife Photographer of the Year 2017 Polar pas de deux - Eilo Elvinger - Wildlife Photographer of the Year Eilo Elvinger/Wildlife Photographer of the Year Wildlife Photographer of the Year 2017 Wildlife Photographer of the Year 2017 The incubator bird - Gerry Pearce - Wildlife Photographer of the Year Gerry Pearce/Wildlife Photographer of the Year Wildlife Photographer of the Year 2017 Wildlife Photographer of the Year 2017 Tapestry of life - Dorin Bofan - Wildlife Photographer of the Year Dorin Bofan/Wildlife Photographer of the Year Wildlife Photographer of the Year 2017 Wildlife Photographer of the Year 2017 In the grip of the gulls - Ekaterina Bee - Wildlife Photographer of the Year Ekaterina Bee/Wildlife Photographer of the Year

There are estimated to be around 30,000 rhinos of all five rhino species surviving in the wild, and South Africa is home to the vast majority of the world’s rhino population.

The South African government has made efforts to combat poaching, using patrols and electronic surveillance to monitor areas inhabited by rhinos.

Though the Kruger National Park, one of the continent’s largest games reserves, still endured extensive rhino poaching, nearly 25 per cent fewer rhinos were killed there than in 2016.

The government pointed to this decrease as a signal that its anti-poaching measures in the park were working.

However, despite these measures the number of arrests of suspected poachers and traffickers declined from 680 in 2016 to 518 people last year.

Moreover, the decrease in rhinos killed in Kruger was matched by an increase in other parts of the country, suggesting poachers have been moving their operations elsewhere.

WWF has also warned that the decline of rhino poaching in Kruger was accompanied by an increase in elephant poaching within the park.

Rhino poaching is largely driven by demand from Asian countries, notably Vietnam and China.

There is a pervasive but incorrect belief within these countries that rhino horn has medicinal properties, and can be used to treat a wide variety of diseases including cancer.

Campaigners have emphasised the need to tackle the illegal supply chain in its entirety in order to prevent rhino poaching.

“We must also shine a light on the on-going struggles facing the people whose safety and livelihoods are threatened by this illicit trade,” said Ms Kinnaird.