The sun had set some time before this shot was taken at the waterhole at Okaukuejo camp. The waterhole is flood-lit, but it still needed a burst of flash to light the subject. Canon EOS-1D III with 400mm f/4 DO IS lens and 1.4 converter.
Ref: Black Rhinoceros-2010-04
Location: Okaukuejo, Etosha National Park
Photographer: Brian Sugden