THE OPERA OF PREHISTORIC CREATURES
The opera is performed by three creatures vocal tracts and their synthetic vibrating vocal cords. Left to right: Entelodont, “Hell Pig”, -25M years ago; Ambulocetus, “Walking Whale”, -50M years ago; Mammoth Imperator, -4,5M years ago – Photo credit: Dirk van den Heuvel – March 2013
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