Musk Ox - Facts and Adaptations
Ovibos moschatus

Previously widespread across the arctic but wiped out in many places by over-hunting. Musk oxen live in the tundra regions of the high artic, they are grazing animals, more closely related to sheep and goats than to oxen, their Latin name Ovibos means literally "sheep-ox".

Distribution range of Musk Oxen. Red - historical natural range, Blue - introduced populations

  What are Musk Oxen like? how do they survive?

Musk oxen live in the tundra regions of the high artic, they are grazing animals, more closely related to sheep and goats than to oxen, their Latin name Ovibos means literally "sheep-ox". The name musk ox comes from the strong scent emitted by males in the breeding season, though it is not actually musk.

The species was previously widespread across the arctic but were wiped out in many places by over-hunting. Conservation measures put into place have helped to reverse their decline as have re-introductions especially to places across northern Europe and Asia. Many of the populations are isolated however and are vulnerable to disease and changes in climate. Their main predator is the arctic wolf which hunts them in packs, grizzly and polar bears may take juveniles or infirm older animals.

Musk oxen live in small family and extended groups in the summer of as few as 5 animals, in the winter they may join other animals and form groups of up to 60 individuals. Larger groups help provide protection against predators and also the weather by standing closer.

The musk ox is an animal of the far north. It lives its whole life above the northern tree line in the Arctic tundra. They survive in some of the harshest places in the arctic, they have a number of anatomical, behavioural and physiological adaptations that allow them to do this successfully.

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Musk Ox Adaptations:

• Moving seasonally to where the easiest available foods are found (behavioural) - Musk oxen feed on grasses and seasonal wild flowers in the spring and summer months which they often spend in river valleys near to water. In the colder months, they move onto eating roots mosses and lichens which they access higher up hillsides to avoid deep snow. They will dig through ice and snow using their hooves to reach food, while there may be more of these foods in the valleys in winter, they are more difficult to access than on exposed hillsides and at higher elevations where the snow and ice covering is much thinner.
  
  
• Long, thick hair, the most obvious feature of a musk ox is its long shaggy coat (anatomical) - which gives them the appearance of being larger and more powerfully built than they really are. Like many cold climate mammals their coat consists of long outer guard hairs providing direct protection against the weather and a shorter inner coat to give extra insulation. In the case of the musk ox, this inner coat (called qiviut and prized as one of the lightest warmest wools available from any animal) grows in time for the winter months and is shed at the end of the winter when it starts to get warmer again. The outer hairs can be as long as 60cm (24 inches).
  
  
• Low surface area to volume ratio (anatomical) - Like many cold climate animals, musk oxen are large. Simply being large makes it easier to maintain your body temperature when it is cold as there is relatively less surface area to lose heat from compared to smaller animals. They also have short stocky legs and small furry ears, both of which help to reduce the surface area available for heat loss.
  
  
• Hooves (anatomical) - insulate them from snow and ice. Hooves are made of keratin like fingernail and hair and so are a dead part of the body without any blood circulation to lose heat through. Musk oxen have two weight bearing toes which can spread the weight making for surer easier footing on soft or slippery surfaces. the hooves are also used to dig through the snow to reach food.
  
  
• Thick layer of body fat (anatomical / physiological) - for insulation and food storage to help survive the winter when food supply may be intermittent. Laying down a good fat layer in the summer may mean the difference between surviving the next winter or not.
  
  
• When attacked by predators, musk oxen try to run to nearby higher ground and then form a circle with their rumps together and horns facing outwards (behavioral) - The calves stay close to their mothers' sides while the adults take it in turns to rush out to attack the predators with their sharp horns. This is a good strategy against animal predators but not against humans who can take advantage of this tendency to stand their ground to pick the musk oxen off with (historically) bows and spears.

A small family group of musk oxen on Devon Island in Arctic Canada, typically they are near water in the valley bottom and feeding on the brief lush growth of seasonal grasses.