The Marsh Frog is green and brown with black markings and has a creamy-white underside. It is about 12cm long and has a yellow-green stripe running down its back.

The two possible confusion species are Pool Frog (Pelophylax lessonae), which is very rare in Britain and Common Frog (Rana temporaria). Marsh Frog (Pelophylax ridibundus) is larger than the other two species. 

See our wildlife guide: Amphibians of Leicestershire and Rutland

Unless identified by a recognised expert, a photo is required.

Ponds, canals and marshy areas.

Peak time April to September.

Males have two grey air sacs on either side of their mouths which produce their unique call. Their loud call can be heard quite clearly near breeding sites from April to September.

The most common non-native frog species in Britain. Records are strongly concentrated in south-eastern England but isolated records come from as far north as Scotland.

Rarely recorded in Leicestershire and Rutland.