The marsh frog (Pelophylax ridibundus) is Europe’s largest frog species and was intentionally introduced to the UK in the mid-1930s. Marsh frogs are now predominantly found in south-east England, having expanded from their original introduction site in Kent to the surrounding counties.
Research published in 2016 showed that Common Toads have declined in Britain by nearly 70% over the past 30 years. The decline is unprecedented for such a widespread and ubiquitous species within Europe. There are a number of causes for the decline, but like most species declines, habitat loss is one of the biggest.