Leeches that live in water are called leeches. Leech is a species, and leech is one of them. Those who live on land are called dry leeches or mountain leeches, and those who live in water are called water leeches or leeches.
Leeches leeches suck human blood, so you must pay attention to stay away from them at ordinary times. If you are accidentally bitten, you must dispose of it in time and marinate it with fire or salt.