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 grey colour, usually flecked with black, and large size helps to identify the species. Juveniles have longitudinal stripes but these disappear with age. It is often found out of water, under logs or stones most frequently.

Indicator Species - Leicestershire, Leicester & Rutland Local Nature Recovery Strategy.

A good image and a note of size are generally required.

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. As well as predating small invertebrates they will also feed on carrion.

Widespread and common, though under recorded in Britain.

Commom in Leicestershire and Rutland.