Around 2 million years of evolutionary history separate black and white rhinos according to mitochondrial DNA analysis. Were these two reminiscing? "I was photographing a White Rhino in Etosha National Park busy having a mud bath, when from the opposite side a Black Rhino appeared. Much to my astonishment the two rhinos walked towards each other and rubbed their horns in greeting. I could not believe what I saw, as normally they avoid and ignore each other... I've been a wildlife photographer for many years. Never seen anything like it."