He was known as the Last Male Standing and attracted the attention of people around the world, but on 19 March 2018 the last male northern white rhino died. Sudan, 45 years old, had been under armed guard to protect him from the threat of poachers.

His death is heartbreaking. The extinction of the northern white rhino is happening before our eyes.

Why has this happened?

Rhinos are the targets of poaching because of an insatiable demand for their horns on the black market. It's thought that an average of three rhinos are lost to poachers every day, and poaching gangs are becoming increasingly sophisticated.

Sudan was guarded and cared for by Ol Pejeta Conservancy in Kenya and died at an old age, but for many rhinos it's a different story.