Grindylow

"A sickly green creature with sharp little horns had its face pressed against the glass, pulling faces and flexing its long, spindly fingers."

- Description.

A Grindylow is a small, horned water demon

History
Professor Remus Lupin ordered a Grindylow in 1993 for his third year class to study for Defence Against the Dark Arts.

Two years later, the Grindylows of the Black Lake at Hogwarts School of Witchcraft and Wizardry attacked the students competing in the 1994-1995 Triwizard Tournament. They caused the early retirement from the task of Fleur Delacour, and nearly killed Harry Potter.

Behaviour
Aggressive towards witches and wizards and muggles alike, the Grindylow has only ever been tamed by merpeople; the half-fish beings keep them as pets.

Diet
Grindylows survive, for the most part, on fish, algae, and small sea creatures; however, occasionally they will eat humans (it is for this reason that they are classified as dark creatures.

Habitat
These creatures are found in the weed beds at the bottom of lakes in Great Britain and Ireland.

Physical appearance
The Grindylow is a sickly green colour, with green teeth and small pointy horns on its head. It has long, strong (albeit brittle) fingers which it uses to strangle its prey, and is a rather good swimmer.

Behind the scenes

 * The term "grindylow" was often used interchangeably with the term "hag" in Old English folklore.

Appearances

 * Harry Potter and the Prisoner of Azkaban
 * Harry Potter and the Prisoner of Azkaban (video game)
 * Harry Potter and the Goblet of Fire
 * Harry Potter and the Goblet of Fire (film)
 * Harry Potter and the Goblet of Fire (video game)
 * Harry Potter and the Deathly Hallows
 * Harry Potter and the Deathly Hallows: Part 1
 * Fantastic Beasts and Where to Find Them
 * LEGO Harry Potter: Years 1-4

Notes and references
Strangulot Гриндиллоу