In the picture above you can just see one waiting patiently for the elephant to leave so that it too can quench his thirst.
The rhino below was in poor shape. It appeared to have lost both ears and part of its tail was missing - I suspect that as a calf it had been caught by lion. It was good to see that it survived.
Although the black rhino population is more secure than it has been in the past, conservationists now face a far more dangerous and better equipped form of poacher than ever before and keeping them safe has become harder than ever.
For more information on this and on my black rhino sightings click here to read my latest column in the Malton and Pickering Gazette & Herald.
As I kept watch one evening, a black rhino appeared just as dusk fell, followed, almost immediately, by Africa's most elusive cat, the leopard. It was like waiting for a bus to come and then two appearing at once - I didn't' know which way to point my camera.
The leopard slunk round the rhino and crouched down for a long drink, keeping a wary eye on the rhino as he did so. Then they both vanished into the night, as quietly and as suddenly as they had appeared.