For years, herder Gelegrash had a sideline bringing tourists to see a dinosaur skull hidden near the Flaming Cliffs in Mongolia's Gobi desert. Then, one day, it was gone.
It is one of thousands of ancient fossils that have disappeared from the country since American explorer Roy Chapman Andrews - supposedly the inspiration for the movie character Indiana Jones - discovered dinosaur eggs there nearly a century ago.
Paleontologists and smugglers alike have descended on the sands ever since.
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In his yurt near the red sandstone cliffs, Gelegrash laughed about the skull's potential value: "If I had known it was worth so much, I would have sold it myself."
The dinosaur repatriation drive began when the husband of the country's then culture, sport and tourism minister Oyungerel Tsedevdamba learned a New York auction house was to sell a rare, nearly complete Tarbosaur bataar specimen - a smaller, fiercer cousin of Tyrannosaurus rex.
Palaeontologists confirmed that all known specimens of the fearsome reptile had come from Mongolia's Nemegt basin, raising the question of how it ended up in Manhattan.
Removing fossils from the country is illegal, but "nobody knew what to do exactly", Oyungerel told AFP. "Nobody had claimed dinosaurs from abroad before."
Since Chapman Andrews' discovery, hundreds of expeditions have travelled to Mongolia to look for fossils, some with official blessing, others digging them out illegally and smuggling them out of the country.
It is nearly impossible to prevent thefts from Mongolia's vast steppe, said Surenjav Munkhsaikhan, 31, who manages the national park where Chapman found the eggs.
She is the only full-time guardian of over 10,000 hectares of fossil-rich desert, working with police and her volunteer deputy Gelegrash to combat crimes ranging from illegal mining to the theft of rare plants.
She patrols the area on an old motorbike, but "really wants some drones", she said.
For now the only way she knows a fossil has been stolen is when customs agents catch a smuggler, or one of Gelegrash's fellow herders complains about losing their source of income.
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