"The Beech Marten (Martes foina), also known as the Stone Marten, is the most common species of marten in Central Europe. Beech martens are long, slender, short-legged predators with long, bushy tails. They grow to a size of 40 to 50cm in body length and weigh up to two kilograms. Their brown coats have a forked white marking at the throat, which distinguishes them in appearance from the Pine Marten whose throat marking is cream-coloured and more rounded.
Beech martens frequently live in areas of human settlement, often in attic spaces ...."
Cute animals, really. But not so cute living in one's own attic.