They might be small horse leeches, Britain's largest leech species, which can grow to over 15 cm in length. They are not particularly uncommon, and despite their size and name, they do not suck mammalian blood, instead feeding on invertebrates and decomposing flesh. Or they could be one of a number of smaller leech species, which feed on invertebrates, fish, amphibians or waterbirds.
Interesting hey? What they are NOT are fish leeches that we frequently see on pike in UK waters.
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