Martes foina, commonly known as the stone marten or beech marten, is a small carnivorous mammal belonging to the Mustelidae family, the same group that includes weasels, otters and badgers. The species is widely distributed across Europe and large parts of Asia, making it one of the most widespread martens in the Eurasian region.
Highly adaptable, the stone marten occupies a wide range of habitats, from natural forests to rural landscapes and even urban environments.
The stone marten can be found in woodlands, rocky areas, rural landscapes and agricultural mosaics. It is particularly adaptable and often lives close to human settlements, sometimes using buildings, barns or old ruins as shelters.
In landscapes such as Vale do Lourêdo, the combination of forest patches, stone walls, hedgerows and agricultural fields provides ideal conditions for this elusive predator.
The stone marten has a slender body, relatively short legs and a long bushy tail. Adults usually measure 40 to 50 cm in body length, with an additional 20 to 25 cm tail, and weigh between 1 and 2.5 kilograms.
Its fur is generally brown or grey-brown, and one of its most distinctive features is the white throat patch, which often extends toward the forelegs.
Martes foina is primarily nocturnal and solitary, spending the day resting in hidden shelters such as rock crevices, hollow trees or abandoned structures.
It is an opportunistic omnivore, feeding on a wide variety of food including small mammals, birds, insects, eggs, fruit and carrion. This flexible diet allows the species to thrive in many different ecosystems.
As a small predator, the stone marten plays an important ecological role by helping regulate populations of rodents and other small animals.
In rural landscapes such as those around Vale do Lourêdo, the species contributes to the balance of local ecosystems while also acting as a disperser of seeds when consuming fruits.