Stone marten or pine marten? Can you tell them apart?

When we hear the word marten, many of us think of cables chewed through in a car engine bay or animals running around in the attic at night. But have you ever heard of the pine marten? This is not a typo: the pine marten is a protected carnivore native to Europe, which is so similar to the stone marten that even experienced nature lovers can mistake them for one another.

Yet based on a few small clues, we can tell the two animals apart. In fact, by learning about their way of life, we can also find out why we regularly encounter one of them in cities, while we often do not even notice the other’s presence.

Are pine martens and stone martens really related?

Very much so! The pine marten (Martes martes) and the stone marten (Martes foina) both belong to the weasel family, and within that to the Martes genus.

Their close relationship is also clearly visible in their appearance. Both species have an elongated, slender build, short legs, a pointed muzzle, and a bushy tail. Their body size is also similar: both can reach a body length of about 40–55 centimeters, to which an additional tail of around 20–30 centimeters is added.

Interestingly, despite their names and appearance, neither of them is a rodent. Both are predatory mammals, just like the weasel, stoat, or otter. The real differences lie in the details.

How can we tell whether we saw a stone marten or a pine marten?

One of the simplest ways to distinguish the two animals is to observe the light-colored patch of fur on their chest.

The stone marten’s throat patch is typically white, often split into two branches, and extends down toward the front legs as well. By contrast, the pine marten’s throat patch is usually yellowish or orange-toned, and generally has a rounder, less branched shape.

The other telling detail is their nose. The stone marten’s nose is usually light, pinkish flesh-colored, while the pine marten’s is dark brown or black.

If we can observe them up close, we can discover further differences as well. The pine marten’s ears are usually larger, more conspicuous, and edged with a light border. Its fur is generally more uniform and darker brown, while the stone marten’s coat often has a slightly grayish tint.

In addition, the pine marten’s paws are more densely furred, which can be useful for it in cold and snowy conditions.

However, these traits can vary from one individual to another. It is not always possible to identify the animal seen with complete certainty based on a single distinguishing feature.

The stone marten has conquered the cities, while the pine marten has preferred the forests

Perhaps this is the most interesting difference between the two species. The stone marten is an extremely adaptable animal. It originally occurred in natural habitats, such as rocky areas and forest edges, but by now it has learned perfectly how to take advantage of the opportunities offered by human settlements.

It can also find suitable shelter in attics, outbuildings, garages, and even in car engine bays. In settlements, it can also find abundant food sources, as it can feed on smaller animals, fruits, and food accessible near humans alike.

By contrast, the pine marten is primarily an inhabitant of forested areas. It especially likes forests dotted with old, hollow trees, where it can find suitable hiding places and move about easily in the canopy.

This, however, does not mean that we can never encounter it in inhabited areas. It may also appear in gardens near forests, parks, and smaller woodland patches. At the same time, it generally seeks human proximity less than the stone marten.

The pine marten moves through trees almost like a squirrel.

One of the pine marten’s most remarkable traits is its exceptional agility. Of course, the stone marten also climbs skillfully, but the pine marten is especially at home in the treetops. It can run effortlessly along thicker branches and is even able to leap from one tree to another.

The conservation experts of the Körös-Maros National Park compare the pine marten’s movement to that of a squirrel. According to their report, it can even cover greater distances without descending to the ground.

The hollows of old trees are especially important for it, as they can provide not only a resting place but also a safe den for raising its young. This also explains why the disappearance of old, hollow trees is a problem for the species, especially in cities. For a pine marten, the forest is a complex habitat in which both the ground and the canopy play an important role.

What does the pine marten eat? And what does the stone marten eat?

Both animals are fundamentally carnivores, although neither feeds exclusively on meat. The pine marten’s diet may include smaller mammals such as mice and voles, as well as birds, eggs, and various insects. Occasionally, it may even prey on squirrels.

What may be surprising, however, is that it also specifically likes forest fruits and berries. It consumes sloes, rosehips, hawthorn, and other plant-based food as well.

The stone marten also has a varied diet, but it also makes use of food sources provided by human environments. Along with small rodents, birds, and fruits, it can also consume easily accessible leftovers. This dietary flexibility greatly contributes to the stone marten’s ability to thrive successfully in urban environments.

The pine marten is protected in Europe, while the stone marten can be hunted.

Although the two species are closely related, their conservation status differs significantly. The pine marten has been a protected species since 1974, with a current conservation value of 50,000 forints. This is not the animal’s market price, but the conservation value defined by law.

In Europe, it occurs mainly in the forests of Western and Northern Central Europe, but it has also been observed in lowland floodplain forests. Its exact population size is not fully known, and because it is secretive and mostly nocturnal, its presence is not always easy to notice.

By contrast, the stone marten is a huntable species in Europe, for which the applicable hunting regulations set a year-round hunting season. This of course does not mean that anyone can capture or kill it without restrictions.

Precise distinction between the two animals is therefore important from a conservation perspective as well. Further information about the pine marten’s protected status can be found in the official species profile of the European nature conservation authority.

Does the pine marten also chew car cables?

If they are so similar to each other, it is fair to ask: can the pine marten also cause the kind of damage that stone martens have become notorious for?

In practice, the weasel-family visitor found in car engine bays is typically the stone marten. The pine marten mainly uses natural, forested habitats, and it is not known as a regular engine-bay culprit like its city-dwelling relative.

Of course, the appearance of a pine marten near a car parked close to a forest cannot be ruled out, but chewed cables or paw prints found in the engine bay should not, by themselves, be taken as proof of either species’ presence.

If you want to find out what traces martens, as well as mice and rats in the engine bay, may leave behind, it is worth reading our previous article: Rodent or marten in the car engine bay: signs, damage and protection.

And you can read about how to gently keep martens away from cars and buildings in our article titled How can we protect against martens that cause damage worth hundreds of thousands?.

We developed the Vadalarm AutoGuard car marten repeller to help prevent damage caused by martens, which uses a combination of ultrasound and flashing light to try to keep away animals that dare to enter the engine bay.

Two close relatives, two different ways of life

The stone marten and the pine marten are a great example of how two closely related animals can adapt to different living conditions. While the stone marten has successfully conquered human settlements, the pine marten has remained primarily a hidden dweller of the forests. Their appearance is deceptively similar, but their throat patch, nose color, and habitat can all help a great deal in telling them apart.

If you next spot a small brown predator with a long, bushy tail in the forest, don’t assume for sure that you’ve seen a stone marten. It may well be that you have observed its lesser-known relative, the pine marten.

And if that really happened, it is worth admiring it for a few moments. We do not get to see such an agile, elusive forest predator every day!