These are apparently antelope with afterburners. We saw a group of half a dozen running flat out across the (large) summit of Steens Mountain, going what seemed like as fast as an animal could possibly run, when the one in the lead shot out in front of the others like they were standing still. Unforgettable.

Sorry about hijacking the thread.
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Always remember that you are absolutely unique, just like everybody else. -Margaret Mead