This was on a safari in Kenya. We actually stayed with this lioness over an hour to get this two minute video. She did a lot of careful creeping towards her prey (we were between her and her antelope). She was with another lioness, and they were using a strategy of a "striker" and a "catcher". The striker would drive the prey towards the catcher, who would make the kill. In this case this lioness was the catcher, but shortly after this video clip they gave up and didn't attempt a kill because the antelope wandered too far away to be caught by surprise. More still photos of this trip can be seen at flickr.com/photos/holtby/15110990265/.