Photo de stock - 21 January 2023, Thuringia, Gera: Frank Hrouda looks at the reconstruction of a cave hyena during ""Prehistory Day"" at the Natural History Museum. The molars of adult mammoths and mammoth calves from the Lindenthal hyena cave, which are kept in the museum, were threatened by decay. Thanks to a special preparatory treatment in Goch, the teeth found in 1874 in Gera-Pforten could now be secured and preserved for the future. Photo: Bodo Schackow/dpa. - Gera/Thuringia/Germany

Photo de stock: 21 January 2023, Thuringia, Gera: Frank Hrouda looks at the reconstruction of a cave hyena during ""Prehistory Day"" at the Natural History Museum.

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