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Message: <blockquote data-quote="Farnboro John" data-source="post: 3161561" data-attributes="member: 36432">Well, we have a number of hole-nesting bird issues they might help with, quite possibly connected to the two below:- Great Spotted Woodpecker increase- Ring-necked ParakeetPossible knock-ons from the above include decline of Lesser Spotted Woodpecker, Marsh and Willow Tit, though habitat fragmentation is a big one for all of them. As the declining species all use small holes, an arboreal mammalian predator that might preferentially attack larger hole-nesters could rebalance the issue. It's a reasonable supposition given that the species grew up together before mankind took to managing the environment.As you say, Pine Marten is unlikely to be the whole answer, but it may well shift the balance in the fight.John</blockquote>