horse's hooves
Refers to the hooves of a horse. Often used in set phrases like 馬蹄の音 (sound of horse hooves).
The sound of horse hooves could be heard from afar.
Omphalius pfeifferi pfeifferi (subspecies of top shell)
Tectus maximus; top shell species
Compound of 馬 (horse) and 蹄 (hoof).