leech

Leeches

Although leeches are distasteful they do not carry any serious diseases. Their bite may cause secondary infections. Covering up exposed skin, and tucking in trousers helps deter them, but most can still penetrate this
To remove a leech a person can wait until it is sated with blood and it will naturally fall off. To speed up removal applying a lighted cigar, vinegar, salt or chili help. Direct pulling may leave the leech mouth wide inside. Because leeches use an anticoagulant to help them, their bites bleed for a while after removed. Direct pressure is the best way to control bleeding.

Leeches
Austrailian Museum online http://www.amonline.net.au/factsheets/leeches.htm