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Photographer William Walldén describes this encounter in the Serengeti National Park, Tanzania

I was enjoying a week-long safari with my parents in Tanzania and by the second to last day we'd almost given up hope of seeing a southern ground hornbill, which is listed as Vulnerable by the IUCN. But then suddenly we saw one, and it stopped in its tracks in front of us.

   I took some photos then looked around just in time to see another one capture a little hare. The bird then walked away and smashed its prey against the ground to kill it. It then looked back at us for a brief second and that's when I took this shot before it moved on again. I looked down at my camera screen and felt very excited at the result and the privilege of seeing this bird do something like this.