What you need to know as pine martens are reintroduced

If pine martens are not eating berries, they can feed on small mammals like voles.

But Mr Clarke said other mammals had adapted to their presence over the years.

“Red squirrels for example are adapted to pine martens, they’re smaller, lighter and faster,” he said.

“Whereas grey squirrels aren’t adapted to them – so actually it could be beneficial to red squirrels,” he added.