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Despite the name, it does not attack horses and indeed cannot bite mammalian skin at all. This species can be quite large, reaching up to 15cm. Their greenish colour and size helps to identify them.
They are very common around still water and can often be found under stones near to water.
All year round
They feed on smaller animals such as midge larvae and snails but sometimes move onto land in search of earthworms. They are very sensitive to chemical traces in the water and find their prey this way.
Widespread and common though under recorded in Britain.
Commom in Leicestershire and Rutland.
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