Our ecosystem is a delicate thing, with every element of it from the fish to the badgers to the squirrels and the pine martens
and all the rest of it being interconnected.
John, 49, sat for a month in -30C temperatures during the worst winter in 150 years in the Adirondack Mountains of upstate New York, where he captured the hidden underworld battle between pine martens
So too are pine martens
, with small batches currently being relocated from Scotland to woodland near Devil's Bridge.
from Scotland are being moved to Wales as part of a "carnivore recovery scheme" never attempted before on a nationwide scale.
Given the reliance of the species on forest habitats, the conservation assessment also highlighted the potential for forestry practises to impact on pine martens
It's not always fulsome praise for wildlife, however: Lister-Kaye describes the year-round struggle of guarding his family's henhouse against foxes and the craftier, weasellike pine martens
SQUIRRELS and pine martens
are being fitted with GPS devices to see how they are coping with deforestation in Scotland.
This chicken was one of an increasingly rare bunch still to be found hanging out in the streets, then retiring at night to a breezeblock coop with a wooden flap that can be secured against rampaging pine martens
Mar Lodge Estate on the eastern edge of the Cairngorm mountains in Scotland is home to golden eagles, black grouse, otters, pine martens
and red squirrels, and temperatures nearby have been recorded as low as minus 27.
As well as catching up with the beaver family, the pine martens
, the birds and the red squirrels to find out whether their preparations have enabled them to survive, they will also be reporting on Brighton's urban foxes and looking into the ingenious ways in which our wildlife overcome the hardships of an inclement season.
Another great place to see them is at the New Forest Wildlife Park, where 12 different species of owls share this beautiful part of Hampshire near Ashurst with otters, pine martens
and the endangered Scottish wildcat.
The trio are presenting from their base at the Aigas Field Centre, but they hear from reports around the country, as they follow the fortunes of beavers, red squirrels, pine martens
and a host of other animals.