The article implies Pine Martens are saving the red squirrel as much as a grey squirrel trapping program is. The trapping program was introduced to reduce the grey population and give the reds a chance of survival.
Apparently predatory martens (see image above) are helping to save the red squirrel. It turns out that they are inclined to eat grey squirrels which they find nice and plump. The pine marten can catch the grey because they move slowly. This has been found in a Northern Ireland study where the pine marten isn’t so rare as first thought.
There was plenty of Northumberland wildlife – Red Squirrel included – near Doxford Cottages this May (2012). I have seen the following within 6m of my living room: Brown Rat, Red Squirrel, male & female Great Spotted Woodpecker, male & female Chaffinch, male Robin, Blue tit, Coal Tit, Great Tit, Green-finch, Nuthatch, Wood Pigeon, Crow, Rook, Jackdaw, Sparrow, male & female Pheasant, male Blackbird.
All these creatures have been attracted by a peanut feeder, wild bird seed feeder and a squirrel feeding box. The birds, and brown rat, that can’t feed from the bird feeders (and those that can) have been attracted by the fallout from the feeders on the ground beneath.
Surprisingly the following birds have been able to feed from the seed feeders: Rook, Crow, Jackdaw, Wood Pigeon. The Jackdaw can cling onto the feeders with wire mesh which holds peanuts. They can all reach the transparent seed feeder by perching on the wooden squirrel food box (see my rook picture below). All the feeders are attached to a telephone pole so they are close to each other.