The yak can reach up to 3.3 m in length and can weigh up to 525 kg. Its tail measures 60 cm. It can be found in Eastern and Southern Asia.
Its body is covered in a soft, thick undercoat which is very tangled. The exterior fur that covers its body is generally dark-brown to black. The yak has a hump over its tall shoulders and exterior hairs which are extremely long.
In the wild, it can reach up to 1.8 m in height and can weigh up to 1000 kg.
Yaks are herd animals. The herds can contain several hundred individuals, although many are much smaller. The herds consist primarily of females and their young, with a smaller number of adult males. The remaining males are either solitary, or live in much smaller groups, averaging around six individuals.
The yak grazes on grass, mosses, lichens, and crunches ice or snow as a source of water.
The mating season starts in September. The females can conceive after the age of 3 or 4 and give birth to their calves once every three years, in April or June, after a gestation period of almost 9 months. The calves will be dependent on their mother another year. They have an average lifespan of 20 years.