Crouching near a wooden shed in his snowy backyard, Prokopy Nogovitsyn lifts up a grey tarpaulin and takes out a vertebra the size of a saucer: part of a mammoth skeleton.
"Some friends found this in the north and wanted to sell it," says Nogovitsyn, who lives in a village in the northern Siberian region of Yakutia.
"But it lacks tusks, so nobody wanted it."
They held up placards saying: "Return tusks back to the people!"
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