Red and grey squirrels
So what has this got to do with pine martens ?
It’s not just that pine martens are eating the squirrels: they are terrifying the living daylights out of them.
If grey squirrels have no defences against martens, they must spend much of the time they would otherwise have spent feeding trying to avoid them. They are likely, metaphorically or perhaps literally, to spend so much time looking over their shoulders while they should be foraging during the summer that they don’t accumulate sufficient fat to get through the winter. The pine martens are starving them out.
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