Selkies are mythological creatures that can shapeshift between seal and human forms by removing or putting on their seal skin. They feature prominently in the oral traditions and mythology of various cultures, especially those of Celtic and Norse origin. The term “selkie” derives from the Scots word for “seal”, and is also spelled as , , or . Selkies are sometimes referred to as selkie folk (selkie fowk), meaning 'seal folk'. Selkies are mainly associated with the Northern Isles of Scotland, where they are said to live as seals in the sea but shed their skin to become human on land. Selkies have a dual nature: they can be friendly and helpful to humans, but they can also be dangerous and vengeful. Selkies are often depicted as attractive and seductive in human form, and many stories involve selkies having romantic or sexual relationships with humans, sometimes resulting in children. Selkies can also be coerced or tricked into marrying humans, usually by someone who steals and hides their seal skin, preventing them from returning to the sea. Such marriages are often unhappy, as the selkie always longs for the sea and may eventually escape if they find their skin. Selkies have counterparts in other cultures, such as the Faroese, Icelandic, Irish, and Manx. They are sometimes confused with other seal-like creatures, such as the mermaids or the finfolk. Selkies have inspired many works of art, literature, music, and film. The Scots language word selkie is diminutive for selch which strictly speaking means 'grey seal' (Halichoerus grypus). Alternate spellings for the diminutive include: , , , , , , , etc. The term selkie according to Alan Bruford should be treated as meaning any seal with or without the implication of transformation into human form. W. Traill Dennison insisted selkie was the correct term to be applied to these shapeshifters, to be distinguished from the merfolk, and that Samuel Hibbert committed an error in referring to them as mermen and mermaids.