During a shoot in July 2009 on the Chobe River in Botswana while capturing Hippo shots, I noticed this Hammerkop using the sleeping Hipo as a perching spot on the water. The Hippo did not approve of this and got rather annoyed with the Hammerkop. I managed to capture the process of the Hammerkop landing and being unceremoniously shaken off by the angry Hippo.
Click on the image below to enlarge.
Click on the image to enlarge.