Kelpie

Found along the Scottish coastline, kelpies live in the underwater kelp forests, only emerging to hunt. Outside of the water, their green coat color fades, and the tall coral-like mane and tail fall flat, collecting seafoam to mimic long flowing hair. When disguised, kelpies are nearly indistinguishable from an ordinary horse. Vertical pupils and faint gills along their throats are the only indications to set them apart. Glands along their spine secrete a sticky substance that traps any who dare to ride the animal; with prey entrapped, the kelpie returns to the ocean to drown its victim. Kelpies rely on water for their transformation but some have been seen living deeper inland, stuck in their disguised form and relying on small game to survive.