A skull of gazelle is seen in front of the singing sand, the 150-metre-high by three-kilometre-long dune that generates a low-pitched, organ-like rumble in dry weather, in Altyn-Emel national park in Almaty region, Kazakhstan, May 12, 2016. REUTERS/Shamil Zhumatov SEARCH "SINGING SANDS" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES