does a leech bite?
Yes
Leech
 The best-known species, such as the medicinal leech, "Hirudo medicinalis", are hematophagous, attaching themselves to a host with a sucker and feeding on blood, having first secreted the peptide hirudin to prevent the blood from clotting. 
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Leech [SEP] Introduction
In terrestrial species, the cocoon is often concealed under a log, in a crevice or buried in damp soil. Almost seven hundred species of leech are currently recognised, of which some hundred are marine, ninety terrestrial and the remainder freshwater.