When I was younger I invented a creature called kebritpipianos which was somewhat of a half man-half horse (like a centaur) and terrified other kids regarding it. My description was based loosely on the cover of the book "A wrinkle in Time". I would point out footprints or broken branches as evidence of its existence. I believe I once saw its back end as it was galloping away in the wooded mountains of Fasham although that might have just been a regular horse.