The Russian linguist Menovshikov (Меновщиков), an expert of Siberian Yupik and Sireniki Eskimo languages (while admitting that he is not a specialist in ethnology) mentions, that the shamanistic seances of those Siberian Yupik and Sireniki groups he has seen have many similarities to those of Greenland Inuit groups described by Fridtjof Nansen, although a large distance separates Siberia and Greenland.