Yaks are around 3.3 meters (11 feet) in length, not including their 60 centimeter tail, and stand up to two meters at the shoulder. They weigh up to 525 kilograms (1,160 pounds). Their horns may reach 95 centimeters (38 inches) in length. Females tend to be smaller than males.
Yak's Males spend most of the year alone or in small groups of a dozen males.
They will join the females during the reproduction season. A female gives birth to only one young at a time, every two years, after 258 day (8 ½ months) of gestation.
An individual can live up to 25 years in nature. The Tibetan Wolf is the main predator of the Yak. The 12 millions domesticated animals are precious to the Tibetan people.
They are raised for their meat, wool and milk. According to the IUCN, the Wild Yak is presently on the Red Data List and is considered vulnerable; there would remain only about 10 000 (2001) individuals in the wild.