Thank you all for your most generous comments.
Eight of us had rented a houseboat on the Chobe for a week. It had a crew (who moved the boat to different locations for each night); it towed several small boats with outboard motors which we used to explore the river during the day; and it had a splendid girl who produced wonderful meals for us when we returned to the mother ship.
Late one night, when I was still up processing photographs and she had finished in her kitchen, she came over to look at my photographs. When we got to the Hippos, she shuddered and said: "I hate those animals".
She then explained that her grandfather had been fishing from the banks of the river when a Hippo suddenly emerged from its depths and ran at her Grandfather. He couldn't outrun the charge and the Hippo killed him. Hippos may look ungainly but they can move
very quickly.
This shot shows a Hippo feeding — supposedly placidly:
