The public is being urged to take part in a survey of hedgehogs to see if climate change is having an impact on their hibernation and survival.
It is thought the population may have dropped by a quarter in the last decade.
From a peak of 30 million across the country in the 1950s there may only be about 1.5 million now.
Dr Pat Morris mammal expert from London University explains why that may be happening and what they are asking people to do.
Get in touch with Today via
or text us on 84844.