Are hedgehogs heading towards extinction in Wales? That's the question posed by wildlife expert Iolo Williams who is launching a nationwide survey to find out why the popular spiky creature is in such steep decline.
The hedgehog population has dropped 20 per cent in the past four years which Iolo describes as "an amazing rate of decline".
Yet nobody has been able to explain exactly why they are becoming such a rare sight.
A trend for tidy gardens and decking has been suggested as a possible reason, because they take away the hedgehog's natural habitat.
Similarly, widespread use of pesticides and insecticides could be stripping away the animal's favourite food sources.
Ahead of the return of his series Iolo's Welsh Safari - a programme which shows viewers how to find wildlife safari adventure virtually on their own doorsteps - Iolo is taking up the plight of the hedgehog to try to find some answers.
"It's very serious," says Iolo. "I used to have hedgehogs in my garden every night practically, and I haven't seen a live hedgehog in my garden for the best part of three years now, and the worst thing is we don't really know why.
"There's got to be a whole host of reasons that we don't really understand.
"We need to do quite a bit of research into this because there's no doubting they've disappeared from vast areas.
"We desperately need people to get in touch with us to tell us if they've seen hedgehogs.
"It's the first step in a much more detailed survey. We can use all the information we gather to help the little hedgehog survive."
Each week, Iolo's Welsh Safari will be inviting viewers to help build a map of animal and bird activity by emailing reports and pictures of different species.
People with hedgehog sightings to report can contact Iolo via the BBC Wales nature website.
The initial results of the survey will be broadcast on Iolo's Welsh Safari on Wednesday 3 May 2006 on BBC ONE Wales at 7.00pm.