The wolf (canis lupus) is a big carnivore mammal from the dogs family. Its fur is grey-yellowish, darker in the southern regions or lighter in the northern regions. The wolf length varies from 105 to 160 cm, the usual weight is around 40-50 kilos, rarely more. It can be encountered in Europe, Asia, North America. In Bulgaria the wolf can be seen everywhere in the mountains, lately the encounters are becoming rarer and rarer. During the warm months the wolf lives alone and during the winter they live in packs, which go down around fields and villages and attack live stock. The main source of food for the wolf is wild animals, birds, lizards, frogs,but it also eats fruits, corn and other. During the spring, female wolves give birth to 3 to 14 cubs, usually in holes or rock crevices. Because of his carnivorous nature the wolf was killing live stock, in the past the wolf was considered as pest and hunting groups were organized to kill wolves. Now the wolves are endangered species.