|Muggles' Guide to Harry Potter - Magic|
|Features||Head, forequarters horse, hindqaurters, tail giant fish|
|First Appearance||Fantastic Beasts and Where to Find Them|
Hippocampi are the equine equivalent of Muggle "mermaids": forequarters and head of a horse, and tail of a fish.
The Hippocampus is largely a Mediterranean beast, though a single example was caught off the coast of Scotland by Mermen in 1949.
While the Hippocampus does not appear in the main story, it does appear in the stated from in Muggle mythology. The name has also been used to identify a part of the structure of the brain which is apparently somehow involved with the creation and storage of memories.