Old Norse Mountain Cat
The name “Vielfraß” for the largest of all martens likely originated from a translation error: the Old Norse “fjellfräs” became the German “Vielfraß,” even though it actually means “mountain cat.”
The wolverine’s dietary habits change with the seasons: during the summer months, this large predator has a hard time sneaking up on its prey silently. Therefore, its main diet at that time consists of young shoots, berries, and carrion. Live prey, such as young reindeer or moose, is rare. In the winter months, however, it has the advantage over most other predators, as it usually does not sink into deep snow and can sneak up on its prey silently. During this time, it feeds primarily on meat.
The mating season for wolverines is in the spring, but the egg then undergoes a period of dormancy lasting several months. The embryo continues to develop only during the winter months, and after a total gestation period of up to nine months, the young are born.
| Order | Predators |
| Family | Marten |
| Distribution | Scandinavia, northern Russia, northern North America |
| Habitat | Native to coniferous forests |
| Food | Mice, snow hares, ptarmigans, moose and reindeer calves, scavengers; in the summer, also berries and young shoots |
| Activity | Wolverines are nocturnal animals |
| Weight | up to 30 kg |
| Size | Body length up to 100 cm, tail length up to 45 cm |
| Service life | up to 10 years old (zoo: 18 years old) |
| Reproduction | Gestation period: 30–40 days (dormant for up to 7 months), 2–4 young |
| Risk | Wolverines are not endangered |
| Enemies | Wolf, human; young animals: bear, lynx, fox, eagle |