The marsh frog is not a native species of the United Kingdom, it was introduced to Walland Marsh, Kent in 1934, it is now found in several areas of Kent and East Sussex. Other introductions exist, including colonies in Southwest and West London. More aquatic in nature than the native common frog, the marsh frog can be difficult to locate, quickly jumping into the water if disturbed. It has a distinctive laughing call and is rarely found very far from water. The marsh frog is green and brown with black markings, and it has a bright yellow-green stripe running down its back. It's underside is a creamy-white.