> Studies have also shown the pine martens are effective predators of grey squirrels, giving hope that they may provide a natural control for the introduced squirrel, which damages trees in commercial plantations and has virtually wiped out the red squirrel in England.

If, like me, you were wondering whether they also predate red squirrels, apparently pine martens hunt and eat grey squirrels far more, as they're able to easily raid grey squirrel nests. Red squirrels have evolved alongside pine martens and have better awareness to the threat they pose. This article was informative:

https://www.discoverwildlife.com/news/pine-martens-predate-o...