Wikipedia
Huldufólk ( Icelandic and Faroese hidden people from huldu- "pertaining to secrecy" and fólk "people", "folk") are elves in Icelandic and Faroese folklore. Building projects in Iceland are sometimes altered to prevent damaging the rocks where they are believed to live. According to these Icelandic folk beliefs, one should never throw stones because of the possibility of hitting the huldufólk.
President Ólafur Ragnar Grímsson has explained the existence of huldufólk tales by saying: "Icelanders are few in number, so in the old times we doubled our population with tales of elves and fairies."
They are also a part of folklore in the Faroe Islands. In Faroese folk tales, Huldufólk are said to be "large in build, their clothes are all grey, and their hair black. Their dwellings are in mounds, and they are also called Elves." They also dislike crosses, churches and electricity.
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