Akira, Armando, Thomas and John: Thank you all for your very kind remarks.
Akira, I don't know why rhinos like rolling in the mud but it may be just for fun or to rid themselves from the thousands of Ticks which torment them.
I promised to lookout some Black Rhino photographs. This guy had been in quite a fierce fight and was in no mood to chase us so we were able to get quite close and spend quite a long time with him.
"Black", in his name, refers to the Black River where European settlers first spotted them while "White" (used for another breed of Rhino) is a corruption of the Dutch word for a wide mouth.
This is a close-up of the Black Rhino we found at Phinda:

and this is a longer shot:
