Leech - Theromyzon tessulatum
Family - Annelida
Small gelatinous annelid, green to olive green in colour, a freshwater leech species with six rows of small yellow spots up to 60mm (2.4in) long, feeds on ducks and other water birds entering the nasal cavities and throat. This can cause conjunctivitis, bleeding or brain damage. Found in fresh water except fast flowing streams, it is a common species in the UK and western Europe.
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