There are freshwater, terrestrial, and marine leeches..
Haemophagic leeches attach to their hosts and remain there until they become full, at which point they fall off to digest. A leech's body is composed of 34 segments. They all have an anterior (oral) sucker formed from the first six segments of their body, which is used to connect to a host for feeding, and also release an anesthetic to prevent the host from feeling the leech. They use a combination of mucus and suction (caused by concentric muscles in those six segments) to stay attached and secrete an anti-clotting enzyme, hirudin, into the host's blood stream.(Wikipedia)
When I was a grade schooler in Manila, we would go to the province during summer and spend hours in the river to swim and enjoy the company of our friends. The leeches did not stop us from enjoying the swim. We have ready lighted cigarettes to burn the the creatures and break off its attachment.
It would be a parent’s heartaches if the children turn out to be leeches. Demanding whatever they want from the parents.
Proverbs 30:15 says:
A leech has two daughters, both are named “give me”
