Pine martens are an arboreal hunter. It is native to Europe, stretching into Asia in areas such as Iran and Syria. It is also a native part of the UK ecosystem. Unfortunately, as an arboreal predator the pine marten was horrifically reduced in the UK by the destruction of our rainforests. What few animals continued to survive in fragments of forest left behind, have been persecuted by farmers for their habits of taking chickens and similar animals.
This is why this sighting of a pine marten on the edge of London is so exciting.