An urgent “call to action” has been issued by conservation experts following a study revealing that hedgehogs are on the brink of extinction in rural parts of England.Research shows that the once-common mammal has experienced a rapid decline, with numbers falling by 71 per cent between 1981 and 2023 - a collapse of more than two-thirds of the population.Silviu Petrovan, an assistant professor in Cambridge University’s Conservation Science Group,…