Why the moving of Mark the rhino is no mean feat

Rangers work to push a one of the rhinos that were relocated to the new Tsavo Rhino Sanctuary from the Nairobi National Park. [Jeckonia Otieno/Standard]

It is 10.30 in the morning and a helicopter is flying low over Nairobi National Park.

From its open door, Michael Njoroge takes careful aim. His target? A female rhino scrambling for cover.