As the ash dries hard it is dug out for sale for the construction industry, yet another habitat is created  With the  layers of  rock compacted over millions of years, this soft ash forms perfect artificial gifts for burrowing animals like rabbits  For this young fox, what better place to practise digging than a soft cliff of ash, watched nervously by potential lunch  Another predator not necessarily fond of the ash, but very keen on the animals that it attracts, is the polecat ferret  Once used by poachers many of these agile hunters are now wild and range freely over the rough ground near power stations in search of prey  Round at the top of the ash  are the nest borrows of one of Britain's rarest bird, the sand martin  the monitor of this power station has ensured special  in there so the birds can find ideal nest sites.