Wikipedia

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 silkies, sylkies, or selchies. Selkies are sometimes referred to as selkie folk (Scots: 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...